One Complete Package All steel high-rise. Combination of top spring, pop-up unit and tubular metal arms in one complete package that saves you money. Width of a King Size Bed This 39" wide model can give you about 76"x75" sleep surface when you bring up the lower unit. That's the width of a King Size bed! (Poly Deck Models also available, please inquire.) Mattresses Stay Even The Trundle Beds and High-Rise Frames are both 15 1/4" high so mattresses of equal thickness stay even with each other, and when side by side create sleeping area the same as a King size bed! Special Note Some of the pictures under "More Views" show this item with a polypropylene deck. These pictures are used to illustrate various features of the unit. This unit has the link wire deck as shown in the main picture.