1) stainless steel ball by deep drawing, 2) 304 material with mirror polished outside, 3) Provide professional OEM ... metal parts as required. DesignAccording to customer's drawing with the format like .dwg/.igs/.stp/.pdfMaterialStainless ... yellow passivation, gold passivation, galvanizing, satin, etc.Processing MethodDeep drawing , stamping , punching, bending, CNC spinning, CNC machining, milling ...