These 13.56mhz mifare wristbands are available in adult and child size with different colour options like red, blue, green, yellow, white, black etc... They are embedded with 13.56mhz 1k mifare chip inside which can be read by any 13.56mhz ISO14443A mifare reader. These are ideal for event management, ticketing, loyalty, brand promotion, charity or access controls. These silicone wristbands are 65mm in diameter to fit most adults and the strap stretches easily and they fit great. This is a very well made, durable and comfortable wristband. Waterproof, dustproof and weatherproof.