Fat Brains Oombee Ball is a Matryoshka with a modern twist!Each colourful ball is uniquely textured with fascinating dots, lines, and swirls. The best part? Each ball opens up and fits snugly into the next! Set of textured, tethered balls that open up and nest inside each other Encourages sensory exploration, tactile learning, fine motor skills, object permanence, spatial reasoning A cleverly innovative early-learning experience! Each sphere engraved with vivid textures - Dots, lines, ribs, swirls All parts are tethered together with short, safe tethers Features 4 spheres that fit inside one another - Smallest sphere does not open up.