Use these pebble manipulatives for stacking and developing fine motor skills. Use the transparent pebbles to make artistic designs or teach children counting and sorting exercises. Learning just got more fun! This set of pebbles is perfect for sorting, sensory discovery, color identification, counting, and sand and water play. The set is made up of 36 smooth, transparent pebble shapes in 6 different colors and 3 sizes. These pieces can also be used for light table learning. Pebbles are approximately 2"W.