The IcyBite Keys by Nuby is another innovation in the natural teething process as well as a toy which combines exercise for young hands, gums and teeth. This Nuby teether also features areas filled with prICE. The cool resilient surface soothes and stimulates sore gums safely and stays colder, longer than water filled teethers! The colorful key shapes with raised, offset surfaces assist in the eruption of teeth by gently massaging infants gums. The colorful shapes are also easy for baby to hold and sized for maximum effectiveness as a teether and soother