Unprinted stickers with white face material - antenna cannot be seen clearly from front side. Single adhesive (manufacturer's) available. Easy to use in brochures, posters and packages. Will be delivered as unprogrammed/unformatted a.k.a in manufacturer condition. Rewritable thousands of times if you don't lock the chips. Good compatibility with NFC phones but do check IC compatibility in your use case. Stickers can be ordered with B/W printing (serial number, UID) and as programmed (static/variable data). Available write protection mode for the chip: permanent lock.