... with adhesive sticker, can use on wood, plastic, books directly 2012 Popular Round NFC StickersThis NFC Stickers can be blank white ... *35, 30*15, 20*30mm, φ45, 43*26, 32*32, 37*25, 32*27, 19*35, φ25,100*15, etc.Othersize ... R&D department will do antenna designing especially for you. 2012 Popular Round NFC Stickers