Add some fun to your baby's playtime with the Infantino Rock 'n Stack Rings. This is an easy to use toy that creates interaction between baby and parents. - 100% BPA-Free, Phthalates-Free, Mercury-Free, Lead-Free - Five rings to grasp and stack - Helps develop hand-eye coordination - Bright colors engage baby's senses - Easy for little hands to hold PRODUCT CARE NOTICE: Some parts of this product may get damaged when subjected to boiling water for a period of time using stove and/or microwave oven, or via steamer. According to experts, washing thoroughly with soap and clean running water is sufficient in effectively remove dirt, bacteria, and harmful viruses, just like proper hand washing. UV-light sterilization, while not mandatory, is okay for this product as long as you operate your UV device 100% according to user manual so as not to cause harm to you and your baby.