This wooden abacus features red, blue, and green balls, making it perfect for learning numbers. - Colors: Red, Blue, Green - Material: Wood - Type: Abacus - Size: Approximately 30cm x 27cm x 12.5cm - Design: Stand-up type Convenient for number calculations. The third photo shows the abacus without the backing card. Placing a backing card behind the red and blue balls makes it easier to learn. There are 4 types of backing cards (2 cards because they are double-sided). Thank you for viewing.