Natural rubber balls set. Soft texture makes them easy to grasp, manipulate and chew on by little ones. Contrasting colors and textures are great for sensorial stimulation – both tactile and visual – and further aid in the development of gross motor skills. The smaller balls have corresponding places on the larger ball so little ones can use hand-eye coordination to find and fit the right hole for each small ball. Set includes: 1 large ball (5.5 in. diameter), 4 smaller balls with different textured surfaces (2-3 in. diameter).