Hypoallergenic, the fitbit alta replacement band is made of a flexible, durable premium material which is hypoallergenic and provides comfortable wearing experience. Package includes, 1pc fitbit alta replacement band and 1pc unique design fastener. Features: 1.There are two size to option: Small 5.5"-6.7" 140 mm -170 mm, Large 6.7"-8.1" 170 mm -206 mm. 2.Ultrathin designed makes it more comfortable while wearing your fitbit alta band. 3.There are 4 texture for choice: Z texture, Laser texture, Stripe texture and Smooth texture. You can choose the style you like. 4.Compact designed makes sure the fastener ring protect your fitbit tracker effectively. At the same, it also sacrifice a little bit of convenience, but it is worth. Dimensions&Weight: 1pack Small: 14.5cm*5.5cm*2cm. Weight: 24g Large: 14.5cm*5.5cm*2cm. Weight: 26g Disclaimer: Our Fitbit Alta replacement bands are in NO WAY connected/affiliated to the Fitbit Inc. or to their trademarks "Fitbit", "Fitbit Alta", "Fitbit Alta HR", "Fitbit Flex". We are an independent manufacturer.value/seller of quality replacement bands.