-Ultra Durable, "Kid Tough" Solid Pine Construction--Beautiful 3-stage Protected Pine Lacquer Finish--Fits Twin Size Mattress on Bed & Roll-Out Unit--Bed Dimensions: 81"L x 36"H x 42"W--Both Beds Do Not Require a Box Spring--Roll-Out Trundle Unit Has 2 Working Drawers--Variety of Matching Pieces Are Shown Below-The "Constellations" Collection