It's slinky and flexible, just like our caterpillar friends! When it comes to negotiating a tricky edge, nothing crawls over it like a Cataroller. Five inch (12.7 cm) rollers on a bearing axle. Wide enough to act as a hose roller, small enough to use as a rope roller. It flexes up or down; four units can form a circle in either direction. Rollers insure smooth rope movement. Rollers protrude above side plates, allowing a litter or other wide loads to easily pass over the roller without hanging up. 3/16" (4.7 mm) aluminum side plates, along with 5/8" (16 mm) axle and bolts makes the 26" (66 cm) long four roller unit the strongest edge protection on the market. Additional double roller units may be added on if longer lengths are required. Add on units are 13" (33 cm) long. Weight 4 roller set 4 lbs. 8 oz. (2.04 kg). Made in the U.S.A.