Encourage visual perception, fine motor skills, sorting, counting, stacking, and more! The wonderful tactile experience of the smooth, rubbery pebbles will delight the senses. Set includes 36 plastic pebbles in 6 sizes (3⁄4" x 1-1⁄8" x 1⁄4" to 2-1⁄4" x 3-1⁄4" x 1⁄4") and 6 colors, and 20 double-sided full-color activity cards in a sturdy plastic container.