Product features: novel shape, small and portable, soft PVC plastic coated, soft and comfortable. Four-digit password, safe and convenient, 10,000 kinds of arrangement, password security is more secure (initial password: 0000) High-strength zinc alloy lock head, sturdy and durable, safe anti-theft, anti-corrosion and anti-rust. Specifications: Name: Ring lock Lock cylinder: alloy lock cylinder Inner diameter: 10.5cm, 11cm Colour: Black Material: zinc alloy + PVC Package Contents: 1 x Bicycle Lock Only the above package content, other products are not included. Note: Light 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.