Compatible for Fitbit Ionic Watch It was made by new and high quality material gives you a comfortable experience. Made of Stainless Steel and Premium Iron with Strong Magnetic, it totally waterproof. Small size fit for wrist:5.5"-6.7"inch(139mm-169mm). Large size fit for wrist:6.7"-8.1"inch(169mm-204mm). Please kindly be realize the size of your wrist. Please Note: Sell the Fitbit Ionic band only, the Fitbit Ionic in pics is not included.2 year warranty and lifetime customer service.