Hi-Capacity Universal NFC Tags - Topaz 512- 10-Pack Blue 10 NFC Stickers in Blue on Black - (Also available in 5-Pack) NFC Topaz 512 Tags have about 450 bytes of usable memory. These High Capacity Universal Tags are compatible with ALL NFC Devices. Tags are made of tough water-resistant PVC material with Adhesive backing for easy placement anywhere. Tags are 30mm in diameter & feature an Andy Bugdroid NFC Logo design.