This water cooling adapter set is made of , which can withstand use. Features the copper material, which has high durability, not easy to deform. Fine workmanship, ensures practicality. Features -Color: Silver -Material: copper -Size: 3.00X2.00X2.00cm/1.18X0.79X0.79in Compatible hose: outer diameter 4MM for inner diameter 3-3.5MM hose, outer diameter 5MM for inner diameter 4-4.5MM hose, outer diameter 6MM for inner diameter 4.5-5MM hose, outer diameter 7.2MM for inner diameter 5.5-6.2MM hose, outer diameter 8MM for inner diameter 7-7.5MM hose, outer diameter 9MM for inner diameter 7-8MM hose - This expansion joint is suitable for water cooling applications. - It is a quick coupling, mainly used for water connection and conversion. - Comes with 4mm, 5mm, 6mm, 7.2mm, 8mm and 9mm outer diameter connectors for your different needs. - Special design and it is in fine craftsmanship. It is the best replacement for your old, broken one. - workmanship, reasonable structure, professional and practical, can bring you convenience. Package list: 12 cooling fittings