1.material:PI/PEEK,or other plastic 2.color:black,white 3.type:plain ring 4.size:as your requirement 5.OEM&ODM ... : MC Nylon, UHMW-PE, PU, POM, PC, PSU, PTFE, PPS, PEEK, PSF, PPSU, PBT, PPO/PPE,TPE, UP, Wave-transparent materials ... any inquiry, pls feel free to contact with me. Thanks. PEEK supporting ring/sleeve