Smooth-sanded, over-sized beech wood Jumbo Sensory River Stones feature inset, nature-inspired textures. Children 2 and up can engage in sensory play while practicing stacking and balancing and strengthening their tactile differentiation. A beautiful, subdued colour palette furthers the organic connections during natural play. Set of 10. Smallest stone measures 13 cm W x 6.5 cm D x 3 cm H, largest stone measures 19.5 cm W x 9.75 cm D x 4.5 cm H.