A plain white NFC Topaz 512 tags with our NFC enabled logo . They have a strong white PVC front and very sticky back (3M). As these have the ferrite layer they can safely be used on metal surfaces – but you will be amazed how think these are even with the extra protective layer. These are manufactured for business and used for commercial marketing so very strong and durable as well as having a very strong adhesive applied. At last there is a tag that is compatible with ALL mobiles including the full nexus range, Samsung galaxy S4/S5 and the blackberry range and has enough storage for a vcard with address and to hold as many tasks as required – 454 characters. We have just started to use these tags for a client projects and they have one of the best reading distances we have seen.