Introducing the mattress deck kit - comprising four vertical pieces meticulously fashioned from 3/8" MDF and adorned in black non-woven fabric, the Arbo mattress deck kit redefines the notion of support. Gone are the days of raw, unfinished slats - embrace a more refined, complete feel for your cherished bed frame. For most bed frames this item is best used as a buffer to be placed on top of the existing slats, to ensure ample support.