It can fit the watch perfectly, and the buckle can be adjusted freely with the wrist circumference, making you more comfortable to wear. This watch strap has an ergonomic design, which is not only durable, but also easy to use and easy to install. Made of high-quality silicone material, it is environmentally friendly, soft and durable. The strap has two sides, the lengths of the two sides are 126mm and 92mm respectively. And the width is approx 26.7mm. It is suitable for Amazfit T-Rex A1918 and for Amazfit-Trex Pro. Item Name: Watch Band Material: Silicone Compatible Models: for Amazfit T-Rex A1918, for Amazfit-Trex Pro Wrist Circumference: 5.5-8.7 Size Details: Length: 126mm + 92mm /4.96" + 3.62" (Approx.) Width: 26.7mm/1.05" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Watch Band (Watch Not Included) 2 x Installation and Removal Tools