I've used it for about six months, and there are no noticeable scratches. Thank you. Brand: AKM Features: Motorcycle theft prevention Lock Type: D-lock Product Dimensions (L x W x H): 50 x 180 x 260 mm Material: Titanium, PVC, Alloy steel AKM U-Lock [High Cut Resistance] Bike Lock Bicycle Lock with 1800cm Cable, Extra Thick, 18mm Diameter, Anti-theft, Heavy Duty, Sturdy, Keyhole Shutter, Multi-purpose Lock, Two Keys Included, Black About this product ★AKM Extra Thick U-Lock★ AKM's U-lock uses 18mm round steel, the hardest alloy steel, and undergoes heat treatment and hardening processes, making it harder than ordinary products, and a highly cut-resistant U-lock. It cannot be cut even with a 20-ton hydraulic cutter. ★Dustproof Shutter & PVC Cover★ The keyhole has a shutter to prevent scattered sand, dust, and water from entering the keyhole. It prevents water, dust, and rust, extending its service life. The surface is PVC-processed, so it won't scratch your precious vehicle. Use it with confidence. It feels good to the touch. ★180cm Anti-theft Cable Included★ With a steel wire of approximately 12mm in diameter, it can be used to lock the front and rear wheels, the frame, and a fixed structure such as a guardrail. It can handle the removal of all your important frame and wheels. U-locks that are difficult to ground-lock depending on the location can be ground-locked in any situation by combining them with the cable.