... ; 2. Zinc alloy main support with chrome plated; 3. Elegant design and rust resistance. Detailed product information:Materials: Micro bearing, PA66, Zinc ... : Round type, V type, U groove type,etc.Item NoMain Support MaterialsSurface treatmentUsageRS10087Zinc AlloyChrome platingUpper rollerRS10088Zinc AlloyChrome platingBottom rollerRS10067Stainless steelNonU & BRS10078PolyamidesChrome ...