Silicone material, compatible with many of cell phones and charging treasure. One-piece design for quick disassembly. Anti-slip molecular treatment, close to the tube diameter without slipping. Two choices, free to use, can carry charging treasure at the same time, also can be used alone. Washable material, no residue of dirt left behind. Silicone material, shock-absorbing and impact-, silicone material is fixed at all four corners to protect the phone and mobile power without affecting the fingerprint recognition and face recognition function. high tensile strength design, suitable for all of cell phones and mobile power less than equal 200mm in circumference. Elastic strap, suitable for 22-45mm tube diameter. Colour:Black Material:silicone Package Contents: 1 * Bicycle phone holder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.