1. We use imported LLDPE as raw material which has advantage of impact resitance, shake proof, UV resistance and tastless.2.The "O" sealing strips are installed one the lid of the cases, which make the cases waterproof and dustproof when closed.3.The case are designed with comfortable handle and two wheels, which makes the cases easy to be carried.4.The stainless steel hasp is durable and will never rust.5.Suitable to storage firearms, medical devices, photographic equipment, maintenance tool, emergency supplies, etc.Product size of ZX-584135:External Dim 580*410*350mmInternal Dim 510*340*340mm Difference sizes and colors are available