1K NFC Tags Stickers by AndyTags - 2-Pack Lava Red 2 NFC Stickers in Lava Red color - (Also available in 5-Pack) Tags are NFC Mifare Classic Compatible 1K 13.56MHz High Capacity 1k tags have about 700bytes of writable/re-writable memory. Tags are 30mm in diameter and made of tough PVC material with Adhesive backing for easy placement anywhere. Works with all devices compatible with Mifare Classic Tags (NOT compatible with all NFC Devices.)