Young learners aged 18m+ will build their fine motor skills when stacking these odd-shaped, plastic pebbles. Sort and sequence these pebbles to develop early math skills. Conveniently packaged in a storage jar with lid and carry handle. The smooth, warm texture of these pebbles will delight inquisitive hands. 36 clear, pebble-shaped pieces in 6 colors and 3 sizes. Colors are blue, green, yellow, orange, pink and purple. Sizes are 1.6", 2.25" and 3". Activity guide included.