Organized Living freedomRail Desktop, 48-inch x 21-inch - White Scratch resistant and water proof Constructed of 5/8" melamine laminated particleboard with a radius edge band on three sides Installs easily in just a few quick steps onto freedomRail 18.5" wood Uprights (sold separately) Use with 18.5" freedomRail Heavy Duty Wood Brackets (sold separately) Recommended: Secure in place with freedomRail Heavy Duty Shelf Locators (sold separately) Works with other freedomRail components sold separately