I bought these at the end of August and it's October. I clipped my pens to my bag and they fell off after about a month. In September my needles either fell out of nowhere or I opened a pocket that I had left alone on purpose to avoid messing with the butterfly clips and the clips fell off the needle. I understand that it is natural for them to loosen over time, but I didn't expect them to come loose in a month or so, although I didn't. Don't mess with pins or clips after I put them on for the first time. I replaced the clips with other clips I have yet to use from a tin can and two pins fell off just three days after attaching them. I have 12 contacts and I've tested this on all of them and they all happen at different times/rates.
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