The Evolution Series 4 Integrated Chains are designed to provide convenient bicycle protection in moderate to high crime areas. The hardened triple heat-treated boron manganese steel chains include 10mm six-sided links to help protect against cutting attacks by damaging cutting tools. The integrated chains secure with a new patent-pending integrated Evolution series 4 lock head. This innovative series of chains also feature a patent-pending pin-less design which secures the chain to a hardened deadbolt and allows for no weak leak in the chain due to extensive holding power of the link itself against attacks. Chains are enclosed in a nylon-webbing sleeve to protect paint from scratches and allow for easy portability and tight coiling during storage. Each chain comes with 3 stainless steel keys including a lighted LED key with replaceable battery and 2 new, ergonomic ‘I’ keys. The new ‘I’ keys make opening a disc-style cylinder much smoother.