... )No roller axis of aluminum - black 3)Standard: GB5237-2008 Powder Coating Aluminum Alloy Roller1)Alloy No.:6061,6063...2)Temper:T3 ... Treatment:1,Powder Coating 2,Anodize 3,Electrophoresis 4,Mill Finish 5,Wood Grain 6,Flourocarbon Coating 7,PVDF Coating 8,Polish 4)Coating Colour:silver ... film wrap, string, woden case,or according to customers' need. powder coating aluminum alloy roller