The gray strap is made of antibacterial TPU material. Compared to the black strap, the gray strap is more prone to showing everyday dirt and staining agents. During daily use, it’s best to avoid contact with red ink, watercolor pens, and various industrial dyes. If staining occurs, it is recommended to wipe the strap with regular cleaners such as laundry detergent or soap to remove dirt.
Additionally, the Xiaomi Smart Band 9 Pro offers 8 other retail strap options, which you can choose from if you’d like to switch to a different color.