Wood Designs' Five-Inch Letter Tray Mobile Storage Unit is the perfect solution for organizing classroom papers, toys and teaching materials. The unit is mounted on sturdy casters, so it's simple to move around your classroom, and cubbies provide plenty of space to wrangle your classroom clutter. Sturdy birch construction, rounded edges and a UV finish make the shelving a safe choice for classrooms. Backed by a lifetime warranty. Ships assembled. Choose from three sizes with or without cubby trays.