The See Through Sorting Tray comes as a set of three trays each with a different layout to encourage children to explore sorting and counting. Can also be used with a light panel and for arts and crafts. Use these brilliant trays to explore sorting and graphing. Master challenging concepts like similarities, differences, and merging groups with bar, Venn, and web graph trays. Includes: three 10 x 15 x 1” (25 x 38 x 2 cm) trays and detailed teaching guide. Includes teaching guide .