LibsTag400WLibsTag400W for CDs and DVDs, Size: 116 mm (4. 57 in), Face Material: Transparent Ideal for most library applications Standards: ISO 18000 3, ISO 15693 Frequency: HF 13. 56 MHz User Memory: 1024 bits (32 blocks) Read Write Cycles: 100,000 IC & Inlay: NXP ICODE SLIX with etched aluminium antenna Data Retention: Guaranteed for the lifetime of the library item under standard conditions (20C 68F, 50% relative humidity) Storage Conditions: Temperature: 15C