Heavy Duty sled dolly set has three 7-inch square plates, one for the track and two for the skis. Powder coated steel construction. Premium heavy duty casters have ball bearings with 2.5-inch hard rubber wheels. Ski dollies have groove fits that protect all sizes of skis and the velcro straps secure skis as well. These dollies match up against the very best on the market, but for a fraction of the price! Load capacity of 1,200 lbs per set. Ski dollies have rubber pads to accept dual runner skis and all plates have strengthening ribs to resist bending.