NTAG203 Universal NFC Tags Stickers - 2-Pack Green on White 2-Pack NFC Stickers in Green on White color (SAVE w/ Larger 5, 10, & 20 packs) NTAG203 Tags are compatible with ALL NFC Enabled Devices incl. Nexus 4 & Galaxy S4 NFC Tags have about 137 bytes of usable memory - plenty for task launching apps. Tags are 30mm in diameter and made of tough PVC material with Adhesive backing for easy placement anywhere. Works great with many 3rd Party NFC Android Apps.