Balls for Sensory Development Tullo, Faces, 6 Pieces. Tullo toys for sensory development use various material textures that provide tactile sensations and promote the accuracy of wrist and finger movements. It stimulates the sensory receptors and develops grasping skills. Additionally, it engages the visual sense. During the crawling stage, the baby can roll the balls. They are also useful during teething, as the texture of the balls massages the gums. Tullo toys are safe and reliable. All parts are made in Poland from approved high-quality materials and contain no phthalates, Bisphenol A (BPA), or heavy metals.