LibsTag300LibsTag300 for Audio CDs, Size 44 mm (1. 73 in) Round, White Paper Face. 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 to 50C