Features1There are sequenced magnetism hidden inside the keys, and only keys with the same magnetism sequence can be opened. 2Easy to unlock, insert according to the direction of the unlocking arrowhead, and open with one click, and the key jam will never happen again. 3The lock head is bright and painted, thick antirust lock head is 8cm in length and 3cm in diameter, 8mm anti hydraulic chain. 4The thickness of the chain is 8mm, which is made of antihydraulic shears forged by alloy, and the thick, lacquered and rustproof lock head. 5The overall knitted fabric is beautiful, very durable, dirtresistant and washable. 6Equipped with three keys, the key is permanently magnetized and will not be demagnetized without contact with magnetic objects. 7If you lose the key accidentally, you need to use the number card to match the magnetic key. Be sure to keep the card.SpecificationItem Type:BicycleLockMaterial: Metal + clothPackage List1 x BicycleLock3 x Key