Hardened 3T manganese steel chain with 9mm 4-sided links Integrated chains secure with KryptoLok Series 2 lock head with pinless design to secure chain to a hardened deadbolt Enclosed in nylon-webbing sleeve to protect paint from scratches Comes with 2 ergonomic "I" keys including a lighted LED key Free 1-year $500 anti-theft protection Lifetime manufacturer's warranty against manufacturing defects