perfect for Garmin Edge 520, protecting devices from dirt and scratches and protecting. The wristband design conforms to the human body engineering, uses the environmental protection silica gel material, dustproof and waterproof Soft silicone protective custody for the bicycle computer Garmin Edge 520. All around protection equipment to avoid dust and scratch equipment Quick and simple installation on a bicycle, at the same time prevents the machine from slipping the bicycle. size:76x52x17mm Material:Silica gel colour:Black Package Contents: 1 x Silicone protective case Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.