... UKAS Non sparking Hand tools Ball Head hearing needle,Hearing Needle,Aluminium bronze hearing needle,Beryllium copper hearing needle1.The material : Be ... in explosive atmosphere. There is two kinds of material, Beryllium Copper alloy and Aluminium Bronze.Special tools. 45# steel, 40Cr.Non ... upon receipt of your detailed requirement. Hearing needle,Ball head hearing needle,hand tool hearing needle