The colorful textured pegs move in and out as the cylinder rolls on its soft silicone tires. It's amazingly fun to watch. The textures are fascinating for little fingers to feel. The pegs rattle beautifully when you give it a shake. Plus, it's easy to take anywhere! Sensory learning is on a roll with Rolio. Rolio Sensory toy with fascinating movement Encourages sensory learning, fine motor skills, cause-effect learning Pegs move in and out as it rolls Rolls quietly on soft, silicone tires Pegs are uniquely textured Includes one Rolio Measures 4.25 x 2.5 x 2.5 inches High-quality materials and construction Ages 6 months+