Welcome you visit the produce of our website, and thanks so much, please allow me introduce the details of the products: It is made of galvanized steel wire. Crown:0.45" Width:0.029" Thickness:0.024" Wire Gauge:22GA Model: 6404 6406 6408 6410 6412 6414 6416 The size is similar to the famous brand from abroad such as: FASCO, BEA, SENCO, and PREBENA, MAX and so on. Welcome you inquiry and thank you visit, We are looking forward to your good news.