2nd Generation MVD new concept Roller Pro G2 Full pretension capable Increased lateral agility Reinforced metal parts Same total weight as its predecessor! Design and implementation using state of the art technology CAD/CAM CNC code. High precision engineered to strict specifications Metal parts made of inox steel type 316L marine Reinforced low profile arches improved lateral agility on spear-gun (due to low profile) full pretension capable (100% pretension with no arch deformation) High endurance, low friction Industrial Acetal body 30% larger than "Compact" in all dimensions Fits rubber dia 16-19 mm Real time-tested weight 95gr MVD1020P Please make sure you use a spear shaft with shark pins/fins for your roller setup.