This set includes 4 sorting boxes and 40 wooden disks. Each sorting box features a different colored door (green, red, blue or yellow). And the disks come in a variety of shades to match. Match the disks to each colored box to practice sorting and counting. Each component comes with a chalkboard side to write and draw letters, numbers or creative designs. Made from beechwood and pine, this set is designed to last for years of classroom or home use. For ages 2+. Size of sorting box: 4.7" cube. Size of each disk: 1.8" dia.