6 months & up. Discover new ways to sort and stack with Stackers N' Nesters! This set features six cubes in different colors, sizes, and textures that are stackable and nestable to stimulate visual and tactile sensory. As children grip and place the nesters, they are developing their hand-eye coordination, gross motor skills, and creative thinking. Pieces measure approximately 2.5" to 4.5". Included: 6 colorful, differently-shaped Stackers N' Nesters made of BPA and phthalate free plastic.