Matryoshka with a modern twist! Clever innovation inspires hours of tactile exploration. OombeeBall features 4 spheres that fit inside one another. Each colorful sphere is uniquely textured with fascinating dots, lines, and swirls. Short, safe tethers keep them all connected in a wonderfully wobbly row. But the best part? The larger three balls open up and the smaller ones fit snuggly inside! Gender: unisex.