The cases inner sleeve is made of steel, shrouded in corrosion resistant ABS plastic and outer sleeve is of polycarbonate plastics. Lock body is of spring type structure. It can be hot printed or laser imprinted with six digit consecutive numbers, logo and bar code, alternatively using transfer technology to print the logo on the surface of the inner sleeve. Supplied in white, yellow, or other colors decided by customers. Breaking strength of F≥7000N. ISO/PAS 17712 compliant.