... 5. Mirror polishing Stainless Steel Floating SpheresHollow Steel Spheres, Polished Stainless Steel Spheres, SpheresAdvantage:1. Simple polishing the welding line, ... 201, mild steel, copper and aluminium.3. Welding: The spheres will be welded by machine automatically.4. Waterproof: From ... standard spheres7. Diameters: from 10mm to 1000mmWhat kind of spheres we have?1) 0.4-2100mmStainless Steel Balls 2 ...