Applicable for common ticketing and contactless smart card security， this set of 20pcs Contactless Rewritable 13.56MHz Smart RFID IC Cards Pack must be a necessity for you. It is widely used and suitable for multi-detection. Waterproof， dustproof and with strong resistance to immersion in salt water， alcohol， oil， 10% HCL， the IC cards pack works well in all kinds of conditions and environments. It also brings long service life and high safety thanks to its contactless and rewritable features. Be wise and take it!                                    Features             Contactless and rewritable for offering long service life<br> Compact and portable， easy to carry and store<br> Waterproof， dustproof and with strong resistance to immersion in salt water， alcohol， oil， 10% HCL<br> Widely used and suitable for multi-detection<br> Applicable for common ticketing and contactless smart card security <br>                                                            Specifications             Card Type     1K IC S50    <br> Operating Frequency     13.56 MHz(HF-High Frequency)    <br> Capacity     1 Kbyte    <br> Common Usage     Ticketing， Contactless smart card excellent security    <br> Tested Read Range     2.5 ~10 cm (1 - 4 in.)    <br> Multi-Detection     Yes    <br> Model     MF-01    <br> Material     PVC    <br> Color     White    <br> Weight     3.95oz / 112g    <br> Compliance     MF1 S50    <br> Storage Temperature     40°C~+85°C    <br> Operating Temperature     -25°C to + 70°C    <br> Dimensions     (3.38 x 2.12 x 0.0.3)" / (8.6 x 5.4 x 0.08)cm (L x W x H)       <br>                                                             Package Includes            20 x IC Cards<br>