"grabbing" is what you do not want them to do because that will cause them to take the mounts with them bending things that are not supposed to bend. But yeah, I would assume that poly would absorb the fall better than metal. Dude, just stay away from them. Or go with race railz or barrier bars. Both can be found at motosport.comwell my only hope that having sliders installed would be for an accidental tip over, but if i did lay it down.... would metal sliders grab more than poly and tend to flip the bike over. or are poly better cause there softer and would absorb the initial hit better??