Strap from the company Xiaomi, compatible with the Xiaomi Smart Band 7. It is made of silicone, a lightweight and flexible material that does not wear out from water and sweat. Soft to the touch, it can be worn all day with comfort. Recommended for casual appearances and exercise. 

It features a pin & tuck clasp, which is essentially a small pin that fastens into one of the band's holes, without being very noticeable.