This medium duty 40` hardened chain is wrapped in a soft nylon sheath, sewn all the way to the heads to prevent ripping or tearing Each head is covered in a soft silicon to prevent dinging your bike A 7mm diameter chain and forty inch length lets you lock up the frame and either front or rear wheel Wear this lock around your torso or toss it in your pack, either way, it`s security is sure to keep your bike safe 7mm 40`/101.6cm Key Black 6 of 10 38020UPC/EAN/GTIN: 815189020677