TenCloud 3D Replacement Bands with Metal Buckle for Fitbit Flex Wearables Tracker Wireless Activity Bracelet Blue Made of TPE+TPU, safe and environmental, non-poisonous material, tasteless, non-corrosive Comes with fall-off prevent zinc alloy buckle, adjustable 9 holes, prevent slippery 3D pattern Fits into human body ergonomically, durable, soft hard moderate for comfortable wearing Easy to wear and take off without any interferes, washable for being cyclable Suitable for Fitbit Flex ONLY, NO Fitbit Flex included :)