These XRP Aluminum Performance Hose Ends are Black Anodized and are designed with the aviation nipple and cutter design, to prevent blow off and leakage problems that can be encountered by other styles of hose ends when assembled with stainless steel or nylon braided hose. XRP Hose Ends are manufactured from specially heat treated 2024-T851 aluminum per QQA-225/6 and 6061-T651 aluminum per QQA-225/8 as specified for those fittings. All hose ends are JIC 37°.