1) The interior is of spring and die-cast into shape, the exterior is of plastics. 2) The material is made of aircraft steel string, and add-infused into ABS plastic layers. 3) The lock length is 350mm (can be lengthened); the steel wire diameter is 5mm 4) Tensile strength>1000kgs 5) Firm, easy to seal and credible burglar-precaution 6) Use coverage: all-style containers, container trucks, oil trucks, banking case, electric case, bullet case, etc. 7) Standard colors: red / yellow / green / blue / white