GREENGUARD Children & Schools certified. The Mat Storage Center includes (4) fixed shelves and (8) adjustable shelves to conveniently house up to (12) 2" mats. Shelves are easily added or removed. Up to (24) 1" mats can be housed with purchase of additional shelf packs. Rolls smoothly on (4) swivel casters for easy transport and storage. All surfaces and back are 100% Healthy Kids Plywood with our exclusive Tuff-Gloss UV finish. 49"H x 53"W x 18"D.