... BROTHER machine CertificationISO9001:2008 Material Aluminum,stainless steel,brass,copper Finish painting, plating,anodized,passivation Machined by CNC,Milling, Turning, drilling Tolerance ... etc4. Surface treatment: Polishing, zinc plating, nickel plating or chrome plating, phosphating etc5. Finishing with plating of Nickel,silver,copper, zinc .etc. and anodized ,powder ...