Billings Twin Captain Bed by American Woodcrafters Warmth with a slight industrial edge are the hallmarks of the Billings Bedroom Collection. The Twin Captains Bed headboard and footboard are constructed with the horizontal and vertical solid wood pieces interlocking for strength and a unique design. Two rail positions are available for use with the optional trundle sold separately . Bed requires the use of both a mattress and box spring. Tenon and mortis construction, a centuries old method of joining two pieces of wood together to provide strength and durability., Bed is constructed so the horizontal and vertical solid wood pieces interlock for strength and stability, Two rail positions to accommodate the optional trundle, Mattress and box spring required not included