fitted with plastical shelf.they are made of copper,alminum,alminum alloy,stainess steel304BA,iron,etc 1.Material:copper,steel,stainless steel,alminum,alminum alloy,iron,etc2. Shape:lathe round,punch all kinks of shape,follow cusomer's requirement.3.Surface: tinned,golden,silver,black,Zn,copper....4.Used in Electronics timer stampping metal parts