Melissa & Doug Add & Subtract Abacus - Educational Toy With 55 Colorful Beads and Sturdy Wooden Construction Abacus includes 55 colorful beads and 2 interchangeable double-sided wooden boards Wooden boards feature addition and subtraction and color matching Bright colors and multiple ways to play for growing skill sets Sturdy wooden construction Encourages math skills, pattern and color recognition, fine motor skills, and hand-eye coordination