Our ID is designed to fit the bands produced and sold by Fitbit. There are many companies that produce aftermarket/replacement bands that look nearly identical to the bands sold by Fitbit. If you have a band produced by a company other than Fitbit, we can’t guarantee that our ID will fit. This is because our ID has been precision crafted for the authentic Fitbit brand band. Aftermarket or generic bands may have minor differences that can prevent the ID faceplace from fitting properly.