I ran out of my goto pad, 3M Bumpon and they looked like an alternative so I ordered them. I tried one of the 400 pads on my new USB battery pack and while they seemed to hold up well, the adhesive was too "soft" which caused the pad to slide off where you placed it. Returned the 399 immediately and found/ordered my favorite 3M bumpon which is very durable and doesn't move after being placed. YMMV
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