The Johnniemae Murphy Bed turns one room into two! It transforms any room in your home into a guest room at a moment's notice! The drawer bookcases on either side each have adjustable shelves above and two storage drawers below. Features Strong box steel bed frame The piers on each side of this item are 22" wide. The maximum height of a mattress for this bed is 9"". We recommend an 8"" mattress so that the customer is able to keep sheets on the bed when closed and not in use. The required weight of the mattress is 58 lbs minimum to 70 lbs maximum Natural Variation Natural Wood Grain Color Variation (No item has the same grain color, finish, or wood knots due to natural factors.) Natural Variation Natural Wood Grain Color Variation (No item has the same grain color, finish, or wood knots due to natural factors.)