Fitbit One Band/Fitbit One Clip, HWHMH Replacement Band/Replacement Clip Holder for Fitbit One (No Tracker) 1PC Silicone Replacement Secure Band with Chrome Watch Clasp and Fastener Buckle for Fitbit One Only. Fitbit One Buckle Bracelet, Adjustable Wristband and Wristwatch Style - Fix the Tracker Fall Off Problem. Specially designed to fit the Fitbit One Only. Fitbit device NOT included. One size fits most wrists size. Designed to fit most wrists (6.3"- 8.25"). Simple and functional, keep your Fitbit One on your wrist, simple as that.