... Tolerance at 0.001mm equipped: 280 sets CNC Machines meta yoyo ball turning machining Materials : Iron; Stainless steel 304/316/316L ... ,Head shower,bath equipment,Sanitary ware and so on;-Digital product:Computer,MP3,MP4,Mobile Phone,Digital Camera and so on ... :Telephone,Fax machine,Printer,Walkie Talkie and so on . metal yoyo ball