The Circular Sorter, model G526, is a form board and large knobbed puzzle for children with learning disabilities. Designed to teach shape and color recognition, the puzzle consists of a round puzzle board and five colored circles that children can pull off and put back in the correct spot. Large knobs on each circle assist children with grasping and placement. DIMENSIONS (HxWxL): The puzzle is 2.75 x 12 x 12 inches. The circles range in diameter from 2 inches to 5 inches. The knobs are 2 inches high. COLOR: The puzzle base is natural wood and the circles are red, yellow, blue, orange, and green.