purICE™ Gel stays colder longer than water filled soothers. Teething Nubs massage and stimulate gums. Multiple Teething Surfaces aid in the eruption of new teeth. BPA Free. 3+ months. The IcyBite™ Keys teether/soother by Nuby™ is another innovation in the natural teething process; a toy which combines exercises for young hands gums and teeth as well as providing visual stimulation for your baby. This colorful toy is also a dual surfaced teether. The tops of the Nuby™ "keys" are constructed of a soft textured material with offset surfaces that assist in the eruption of teeth through infants delicate gums. For sore gums the cool resilient bottom part of the "keys" soothes and stimulates safely. Colorful shapes are easy for baby to hold and sized for maximum effectiveness as a teether and soother. All Nuby™ products are made of safe curable materials and exceed all government safety regulations and standards. purICE™ stays colder longer than water filled teethers. Cool only in a domestic refrigerator.