The Super Sort & Count Trays Set from Primary Concepts includes four smaller trays that fit onto the outside corners of a larger tray for sorting and counting activities. Smaller trays nestle within the largest for storage. A snap-tight, see-through lid keeps manipulatives in place. 1.5 inches deep. Large tray: 8.5 by 8.5 inches; smaller trays: approximately 3.5 by 4.5 inches.