2 years & up. Enhance activities incorporating found loose parts using this set of stackable Loose Parts Trays. Each deep, square tray is divided into varying compartments, encouraging children to engage in simple classification and seriation. As children are introduced to new objects, they will develop spatial relationships and strengthen their fine motor skills. Plastic feet on the bottom of each tray ensure a snug fit when stacked between activities and allow for various arrangements and tiered orientations. Each tray measures 15"L x 15"W x 9"H.