... the material can be divided into: brass Jeans Button ,Alloy Jeans Button ,Plastic Jeans Button Electroplating :commonly used in electroplating color: NICKEL ... BRASS;COPPER;LIGHT PEWTER;JAPAN ANTI BRASS,CONTRASTED TIN,etc. Button size calculation methodButton size lignes (L) or millimeter (MM) ... formula: diameter = 0.625 Model * (mm). If there is a button in our hands , but do not know the size of ...