Mobile Cart: Rest mat trolley for vertical classroom storage; the open-ended design means no heavy lifting, simply stack and slide mats into the place; create more room for children to move and play Rest Mat Storage: Cart can accommodate mats up to 23" wide including ECR4Kids Rainbow Rest Mats, Folding Rainbow Rest Mats and Everyday Folding Rets Mats all sold separately Durable Design: The lightweight powder-coated steel frame is designed to withstand daily wear and tear; four locking casters help keep the unit in place to easily load and unload Certified Safe: Trolley is UL GREENGUARD Gold Certified for low VOCs; features rounded edges for additional safety Product Dimensions: Storage trolley measures 47.24” W x 25.2” D x 47.49” H; adult assembly required; Adult Active Engaged & Direct Supervision Required