HopCentury Replacement Fitbit One Wrist Band Wristband Strap Bracelet Accessory with Metal Clasp Fastener for Fitbit One Activity Tracker Replacement waterproof wristbands accessories for Fitbit One only, without tracker and other parts Length: 5.8-7.7 inch Special design for Fitbit One, you can use it like a watch Made of high quality rubber, durable and comfortable for use everyday, environment protection material is safe for human health Please make sure that the metal clip is flat with the band, then the clip is long enough to connect the two layers of the band perfectly. Please refer to the instruction photo and the video, https://youtu.be/HNzChuw42vQ