using high quality low carbon steel , electro-galvanized coated , size from BWG16-BWG12, diameter from 1.6mm-2.87mm. Material:high quality low carbon steel , electro-galvanized coated ,Size from BWG16-BWG12,Diameter from 1.6mm-2.87mm.Distance of each barb with 7.5cm-15cm,Length of barb 1.5cm-3cm.