Features: Waterproof and breathable, allowing your skin to breathe freely, while providing the best for protection for the sensor. The sticking is firm, so you don’for t worry about falling off when you wear it in the shower. Easy to stick, Just tear off the backing paper, you can stick it anywhere on your body. Made of high-quality elastic fabric material, close-fitting and comfortable, can be easily torn off. You can use it with your sensor, and you can wear the sensor for running, mountaineering and other activities. Specifications: Material:Elastic Fabric Color:Transparent Attribute: Oval/Round Round Diameter:Approx. 7cm/2.75inch Oval Diameter: Approx.10.2cm/4.01inch Package Includes: 50x Sport Sensor Sticker note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.