These Blue NXP MIFARE® Classic 1K EV1 Nylon Velcro Strap with White Face combine RFID technology within an attractive and practical housing. They are robust and are easily worn around the wrist with the ability to adjust to the size using the velcro strap. These Blue NXP MIFARE® Classic 1K EV1 Nylon Velcro Strap with White Face are 73mm and come in a pack of 100.