Feature 113.56Mhz UID changeable chip, support protocol of ISO14443A. 2The block0 of card is writable, you can write you won UID into it. 3You can as well utilize it to copy the UID of mf s50 card. 4Made with high quality PVC material for light weight and maximum durability. 5Stable and secure data transmission, very easy and convenient to use.Features: 13.56Mhz UID changeable chip, support protocol of ISO14443A. The block0 of card is writable, you can write you won UID into it. You can as well utilize it to copy the UID of mf s50 card. Made with high quality PVC material for light weight and maximum durability. Stable and secure data transmission, very easy and convenient to use. Specifications: Condition: Brand New Material: PVC Color: White Chip: 13.56Mhz UID Changeable Protocol: ISO14443A Thickness: 0.86mm Size: Approx.85.5*54mm/3.4*2.1in Package List: 10 * IC UID Cards .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }