... silver and nickel.It's good for conducting electrical source. Battery connector's common specifications:1.Material: Cooper ,Carbon steel,Iron ... steel, Stainless Steel,.2.The thickness:0.1mm-5mm.3.Battery type:No.1,No.2,No.3,No.5,No ... treatment:CT plate,Silver Plate,Nickel Plate.5.Applicantions:Lightings,Battery,Telephone,Plush toys,Electronic toys.