brass tube grade:Cu Zn28 Sn1 +B outer diameter: 6mm-50mm thickness:0.3mm-3.5mm standard:ASTMB505J462 mode: hard halfhard soft This product has widely used in resistance to wear washer, bearing, axis guide, spring lamination,pressure gauge, aviation mechanical and electric parts.advanced by hi-strgngth and diamagnetism. Keeping execellent cold-work ability , weld ability and machinability. We have high reputation in our customers and try our best to keep our leading position of copper mine