SIZE: 19mm .With Multiple colors. You can purchase different colors and design your own S watch. Made of Nonallergenic waterproof silicone rubber and Nonallergenic plastic buckle. Non original, excellent replacement. Let your watch look the same as the original. There are antiskid lines on the back. Make you feel light, sturdy, soft and flexible during your wear. Free set of matching spring bars and a tool included. Make it fast and simple to install and change your band in seconds. While most people can do this with just their finger we also include an assistant tool to meet your needs. Size: 19mm .Before purchasing the strap, please refer to the image on the left to measure your strap width. If you are still not sure, please contact us in time.