Made of fabric and 100% Healthy Kids Plywood with Tuff-Gloss™ UV finish for added safety and long lasting durability. Includes four fixed shelves and eight adjustable shelves to conveniently house up to twelve 2" mats. Shelves easily added or removed. Up to (24) 1" mats can be housed with purchase of additional shelf packs. Rolls smoothly on four swivel casters for easy transport and storage. GREENGUARD® Children and Schools Certified. UV finish. Measures 48"H x 53"W x 18"D. Limited Lifetime Warranty. Additional shelf packs also available.