Our line of credentials similar and compatible with the Keri MS format. Compare these fobs, cards, adhesive tags and wristbands with Keri?s PKT-10X, MT-10XP and KC-10X products. This line of 125 KHz RFID credentials work with the Keri systems readers such as MS-3000X, MS-5000X, MS-7000X, MS-4000X. These credentials DO NOT WORK WITH Keri NXT readers and products! FORMAT: Compatible with Keri MS Format APPEARANCE: Black Wristband: Internal diameter 65mm, Fits the average wrist size INFORMATION WE NEED FROM YOU Facility Code: Be sure to let us know what facility code you need Id number range (Card number range)