... : stainelss steel/ Zn alloy Material: copper/stainless steel/nylon Sliding window roller, wheel, window roller, window wheel, door roller, door wheel, sliding roller, sliding ... WhiteWheel Color: White, yellow, blue, redFrame Material: stainelss steel/ Zn alloy.Wheel Material: copper/stainless steel/nylonDurable and safeFine surface and good ...