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. Default colour is black, size 30mm diameter. Other colours are available on request. Smaller order quantities might be available. Please contact us. We also offer price reductions on high order quantities. Please contact us if you have any queries or requests.