With solid tube construction and design, our roll-out trundle will easily fit into any bedroom setting. Its sturdy metal make up will ensure long-lasting enjoyment and support for your mattress. This beautiful trundle frame features high quality metal and caster wheels for easy maneuverability from under your bed. Also, the piece is crafted to easily fit under silhouette collection beds. The slats are 8.5 apart and the material used are metal tubes. 4" X 73" X 39" Mattress is not included