ZipNFC 25mm Round Circus tags with white PVC front and sticky back - this version has the NXP NTAG215 chip. These are manufactured for business and used for commercial marketing so very strong and durable as well as having a strong adhesive applied. These are very popular as they have a long reading distance for such a small sticker. These have many uses but mainly for the back of posters or printed matter in display cabinets. With the PVC backing they are well protected and can be almost invisible. Due to the strong sticky back they can be stuck on any surface, but as with all normal tags, please be aware that these cannot be placed on metal surfaces. If you require a tag to work on a metal surface, please look for our on-metal or anti-metal range.