This sorting and counting tray system is the perfect solution for primary grades activities. Four of the five trays are shaped to nestle within the fifth larger tray with a snap-tight, see-through lid to keep manipulatives in place. The four smaller trays also fit perfectly onto the four outside corners of the larger tray creating the perfect activity space for sorting and counting activities! Made of sturdy and colorful plastic for easy cleaning. Smaller trays are approximately 3.5” x 4.5”. The larger tray is 8.5” x 8.5” and all are 1.5” deep.