iDTRONIC Dome Tags are passive transponders, which are slim, unobtrusive and robust. With a self-adhesive sticker, they are easy to mount onto any surface. Our default colour is black, but if you prefer a different colour, please contact us. The size of this tag is size 30mm diameter. This product is sold in packs of 100 pcs. Smaller order quantities are available. Please contact us. We also offer price reductions on high order quantities.