Super elastic, Ultra soft silicone, Air ventilation system ,Natural latch on due to the wide breast shaped nipple, Unique petals for a soft, flexible nipple without collapse, Advanced anti-colic system ,BPA free nipple, Compatible with wide neck feeding bottle , Compatible with wide neck feeding bottle, Made of premium quality, BPA free silicone which is safe and hygienic, Replicates the shape and consistency of the mother's nipples for the perfect experience. Eco-friendly,soft, flexible, durable,can be intensely sucked and bitten, Pack Of 2 Nipples