Gel Tiles are a perceptual training activity designed to encourage manipulation for children with cognitive, developmental, fine motor, neurological, or upper extremity disabilities. These sealed plastic tailes are filled with brightly-colored, non-toxic gel that reacts to hand pressure. Set includes six tiles ranging in a variety of shapes (circles, squares, etc.). DIMENSIONS: Sizes range from a circle 3 inches in diameter to a 20-inch square. COLOR: One tile each of red, yellow, green, blue, orange and lemon.