This three pack of transparent sorting trays are the perfect size 12" x 17" x 1" (30.5 cm x 43.2 cm x 2.5 cm) to use on the A3 sized light panel. Two trays can be cooperatively used on the larger A2 sized light panel. The 3-dimensional style holds loose materials, so nothing will roll away. Includes 3 different styles: Venn diagram, web tray and bar chart. Teacher's guide included. Grades K+.