The Rainbow Rings from B. baby are a sensory twist on classic stacking play! The 7 stacking rings offer a lil' something extra for little ones to explore as they reach their developmental milestones. Two top rings double as worry-free teethers for babies to nibble on when they need a break from all that stacking! Your baby can stack the rings up any way they like, and will love discovering the two sensory rattle rings – shake, shake! Everything is made of safe and worry-free materials, and these rings are easy for tiny hands to grasp and play with. Not to mention that stacking these colorful and textured rings can help improve your baby’s sensory development, problem-solving skills, fine motor skills, and hand-eye coordination. Start stacking the rainbow! Recommended for babies 6 months and over.