Nail book needle size: 10 #, unified (24/6), 26/6, thick layer ShuDing: 23/8, 23/10, 23/13, 23/15, 23/17, 23/19, 23/23
General is iron wire, or nickel plating nickel above of zinc alloy as antirust, wire insideHave Fe C S P Mn Si, and a small number of Cu etc, including the...