... competitive price various chips are available Blank RFID Proximity Card TK28 FeaturesLF/ HF/UHF operational frequency chips are available.R/W ... .84mmColor: white, custom made printingOperational Frequency: 125KHz/13.56MHz/915MHzAvailable chip:125 KHzTK, TK4100, EM4100, EM4102, EM4450, T5577, Hitag1, Hitag2, HitagS256 ... card, member card, and etc. ISO Blank RFID Proximity Card TK28