The Rock N Roller R2 Micro Truck is the smallest model in the RNR line handling up to 350 pounds. The rugged steel frame expands from 26" to 39" long with 25" and 20" foldable sides. Solid rubber wheels are smooth and durable. This convertible cart i ngeniously changes shape and length for varying load sizes and folds small for storage. Specifically designed to meet the requirements of car and air travel Rock N Roller Multi-carts are the best-selling cart in the music industry.2-wheel hand truck formation has a long nose and stair climbers to maneuver bulky equipment over stairs and curbs. 25"/20" (front/rear) foldable sides rotate and lock into place easily. Perforated front axel reduces weight.6 x 1.5 inch solid rubber rear wheels with pol ymer hubs. 4 x 1 inch front swivel casters with soft thermoplastic tread for a smooth quiet ride. The Rock N Roller R2 Micro Truck is extremely versatile and ideal for carrying guitar/bass equipment karaoke machines and photo/video gear