So, let’s see if I understand: are you saying you know you will hurt your hand at some point in the future, and you’d rather not compound the injury with bits of broken glass? 
In which case, yeah, I see where you’re coming from.
Exactly that!!
I know this is not an issue for most people. But it is a concern for me. 
Aren’t you concerned it’ll fuck up a Flex device? They might not shatter, but I’m fairly certain you can break a connection in them with a lot less force than it would take to break a glassie.
Yes, I am.
Although…
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I assume a flex device would deal with sudden blunt force trauma better than an xSeries. I might be wrong… but this is the weakest of my reasoning elements.
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I am far more concerned with consequences over a serious accident. a Flex would not “add to the calamity”
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And if the flex breaks… I just open the pocket again and replace it.
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Well, like I said, a properly placed glassie should be fairly impervious to damage.
Properly placed for me means:
- Surrounded by meat in the direction opposite any shock it may sustain directly
- “Caged in” by bones, such that most hits would hit your bony bits before reaching the implant
The former ensures that the force is absorbed by the meat and not by the implant (i.e. the implant only transmits the force to the meat) and/or gets out of the way if pushed hard enough. The latter ensures your bone(s) would have to break before the glassie does.
An improperly placed glassie would be one that rests on a bone, can’t get out of the way, and can get hit directly. That’s the only instance where I can see a glassie breaking.
I think your likelihood of damaging a Flex with a bad hit is a lot higher than breaking a glassie, quite frankly.
So here are the Adhoc results from my FlexKeyhole.
~45mm x 18mm
- NFC Nail
- T5577 15mm Disc ( Aliexpress )
- SLIX ISO15693 ( Aliexpress )
The testing differences were negligible if any at all, The only exception was the NFC nail range decreased when lying perpendicular to the SLIX antenna.
LED Nail standalone
~12mm with my phone Galaxy S9
30mm Proxmark RDV4 factory HF antenna
LED Nail Keyhole
~12mm with my phone Galaxy S9
30mm Proxmark RDV4 factory HF antenna parallel
20mm Proxmark RDV4 factory HF antenna perpendicular
FlexEM Standalone
~15mm
FlexEM Keyhole
~15mm
HF SLX ISO15693 Standalone
~15mm
HF SLX ISO15693 Keyhole
~15mm
Hopefully Amal finds this interesting enough to do some proper testing when he has some LAB time.
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So in regards to the above discussion between rosco and pilgrim
Rosco is saying the HF is what really benefits from a bigger coil, I can agree with his statement of LF glass doing a solid job
Here’s my question,
The FlexEM is obviously a premade coin tag, with some Amal goo,
They surely make HF coins of similar size and shape, would that be superior or inferior to the HF flex we are used to?
They do:
Imagine one of those with a flexEM in the middle: looks familiar?
That’s still bigger than a flex em,
I’m just curious if a Hf the same size as the flexem would be better or worse than the flex wedges
Absolutely xSeries LF perform very well. BUT not as well as a FlexEM.
The HF FlexDiscs are LARGE and with that, you get great range / performance.
However
I think what @Eyeux and I are saying, is, Not everybody wants the Larger DiscFlex like the FlexNExT or FlexMT etc.
I still have a FlexMT brand new in the pouch because when I see it on my hand, it takes up a lot of real estate, and on my wrist, it is slightly too large.
I believe I could get 2 Flex Wedges in the space of 1 Flex Disc including separation.
Don’t get me wrong, The FlexMT performs amazingly, and is exactly what I wan’t ( actually I would go gen2 over the 1a ) but it is just too big for me.
The “Keyhole” however would easily fit 2 on the back of my hand for example, and I would then have decent read range on 2 implants with 2 LF and 2 HF options.
Imagine this as your HACKER HAND ©
You could have:
NExT
FlexMN Wedge plus FlexEM
FlexM1 plus FlexEM
giving you the following options with only 3 implants in one hand
3 of these (changeable)
EM41xx
EM4200
HID
AWID
Indala
Others…
2 of these ( 1 changeable 1 not changeable {NExT} )
NTAG 216 (true)
1 of these ( changeable )
UL_EV1 48 bytes
UL_EV1 128 bytes
NTAG 210
NTAG 212
NTAG 213 (true)
NTAG 215 (true)
NTAG I2C 1K
NTAG I2C 2K
1 of these ( changeable NUID)
Mifare S50 1k Magic
Throw in some coloured BLINKIES and you have yourself a hand almost as powerful as THANOS
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No way you will get 2 flexEMs on one hand.
I should have worded it differently. Yeah they would fit. But I bet you would have problems getting a read.
It would definitely need testing before installing
If they were installed as per the photo above, rotating the wrist about the central axis, there would be around 30° difference when presenting flat to a reader
the other option could be to spin one around 180° with the FlexEM at the knuckle.
All theoretical at the moment.
I have 2 xems about that far, and if I didn’t have a 90° bend it might be problematic
That’s just asking for interference
Nope, I think it will come down to the reader, and then how you approach it.
I just did a test with my proxmark, and it was easy as to get separate reads consistently
The proxmark is a bit anemic though, a more powerful reader might light up both
I have to press my hand into the proxmark to get a read, and I get 2” with the xACv2
The Proxmark was all I had easily available.
I think the approach will be the key 
to it.
I will test it on an xAC tomorrow.
Put it this way, I am pretty confident it will work
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I’m sure we all found it very interesting as well!!
That was a great test! and well pointed out!!
And thanks for the quick reply! shame I fell asleep right before!
Exactly my point/case.
I agree with @Pilgrimsmaster here…
If you go straight into the reader you will obviously have interference…
But you could just approach from above the reader for the pinkie implant, or from bellow for the index one…
I just strapped 2 ntag cards to my hand, partially overlapping each other, and was pretty easy to get each one read individually.
That said, I would still aim that implant for my wrist anyway. 
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I don’t either. I want a small grain-rice-sized implant that reads from 3 feet away. But it ain’t happening.
My point was, going from glassie to full size disc size yields considerable range improvements that make the inconvenience of implanting a large HF implant worth it. Going from glassie to narrow Flex barely is: it’s almost too much inconvenience for not much better performances, even if the inconvenience is fairly minimal.
If you tack a narrow Flex it to a half-size disc that requires more invasive pocket-making anyway, then it makes the whole affair completely pointless for the proposed performance improvements. At least for me anyway. To each his own