Smith System book trucks carry up to 400 lbs. of books, paper and projects. They move easily with 4" dual wheel casters that won’t shimmy like single wheel casters. Constructed of 18-gauge welded steel. Optional shelf dividers are available. Quick ships in Navy, Sand, Black, and Champagne. Also available in Forest Green, Purple, Burgundy, Yellow, Red, Blueberry, Mint, Clementine and Platinum. Ships freight.