• The adjustable skates are actually 2 skates each. They are connected by two steel rods making one skate adjustable from 500mm to 1400mm (model CM60) and 720mm to 1500mm (model CM120 and CM240). • Model no. “-N” means the wheels are made of Nylon • Model no. “-P” means the wheels are made of Polyurethane material Capacity - 12 Ton Load Wheels - 8pcs Wheel Size - ø 115mm x 60mm (4.5" x 2.4”) Skate Size - 400mm x 345mm x 145mm (15.7" x 13.6" x 5.7”) Weight - 40Kg (88Lbs)