... Bundy Tube/Pipe Material :SPHC, SPCD,ST-14,BHG,BCD Outdiameter :3.17mm-12mm Single Layer Copper-coated Steel Bundy Tube/Pipe ... Features :1) Material :SPHC, SPCD,ST-14,BHG,BCD2) Outdiameter ... .4) Surface treatment :Copper coated or zinc coated are available Single Layer Copper-coated Steel Bundy Tube/Pipe