Attract little learners to the power of addition! Just adhere the magnetic cups, funnel, and tray to any whiteboard for clear and simple addition demonstrations. Drop the balls into the cups on either side, tilt them over so they fall into the addition funnel and on through to the numbered tray, and then count them up! Includes 2 cups, funnel, 20 balls (10 green, 10 purple), and tray. Tray measures 11"L.