Fellowes 25004 12-Section Compartment Sorter, Melamine Laminated, Dove Gray 12-Compartment desktop sorter includes labels and plastic channels. 200-lb. test corrugated fiberboard divider system. Constructed of 5/8" thermalfused melamine laminated particle board. Constructed of 5/8" thermal fused melamine laminated particle board. For letter size materials.