Work Surface: 1" Thermally-fused melamine or 1 1/8" high-pressure laminate with T-mold edge is standard. Tops interconnect for added stability. Bases: Welded steel. Hutches: 5/8" thermally-fused melamine or high pressure laminate risers-steel bin. Over-the-top style door. Lock standards. Task light standard on laminate hutches. 20 1/2" clearance under bin. Melamine hutches come with wheat fabric tack board. Bookcases: 5/8" thermally-fused melamine or high-pressure laminate risers-steel shelf. Melamine bookcases come with Wheat fabric tack board. Color Combinations: BB: Birch Melamine with Blond Tan. GR: Fog Gray Melamine with Gray paint. OC: English Oak Melamine with Charcoal paint.