ACTIVE WINNER Bicycle U-Lock Bike Lock Silicone Cover Material: Cover: Silicone / Body: Alloy steel Item Weight: 370 g Length: 17.5cm Used for about 2 years. There are scratches from use, but there are no problems with the locking function. ◆ Advantages ◆ 1. Unlike chain or wire locks, this sturdy lock protects your bicycle. 2. Smooth silicone resin processing. Surface material that considers the maximum damage to your precious car. 3. Hardened by heat treatment for strength and durability! The U-lock, which has undergone a special process, is not easily broken! A strong ally against theft. 4. A pure copper braid lock cylinder with excellent security performance for a professional-grade security system! 5. The pure copper serpentine slot key formed with complex grooves reduces the rate of malicious unlocking! Only the owner can unlock it!