Brass Finish: The traditional choice. Smooth action and heavy. Low static build up. 6061-T6 Aluminum Finish: The choice for individuals stacking synthetic or heavy static materials. Smooth action and light. Very low static build up. 400 Grade Stainless Steel Finish: The heavyweight of stackers. Smooth action and very stout. Low static buildup. Best for stacking heavy materials. Neoprene Padded Base