Kryptonite security levels: 1 (Low) - 10 (High) 9.5mm four-sided chain links made of 3t manganese steel 9.5mm four-sided chain links made of 3t manganese steel Protective nylon webbing with hook-n-loop fasteners to hold cover in place and prevent scratches to bike frame Hardened Steel bodied Padlock with 2` x 11mm hardened steel shackle Retained shackle side allows chain to be carried around waist High security Pin-style cylinder 2 ergonomic keys with coiled wrist key chains