Manufacturing pin and sleeve devices, of superior quality, can only be accomplished through the use of high grade materials. That is an important part of the Walther pin and sleeve system - quality products you can depend on. Male pins and female sleeves are made of high conductivity brass. Contacts used with watertight devices are nickel plated to prevent corrosion. The insulated housing is made from a high impact, nylon material. The nonmetallic device, while resistant to most solvents, chemicals and salt water, is also non-conductive, which enhances the safety of the product. All extracts from manufacturing, test standard or independent agency approvals is for informational purposes only and are not intended to be, should not be used as, nor considered to be a complete description of such. Contact customer service for a more complete version of the test standard or agency approval in question. Walther reserves the right to make technical descriptive and dimensional changes due to product changes and/or improvements.