Extra large air holes allow your baby's skin to breathe comfort your baby with a pacifier that allows his skin to breathe. the philips avent ultra air collection has extra wide holes to keep the skin from getting wet. the lightweight pacifier guard is designed to maximize airflow. pacifier feature silicone pieces in package 2 pcs age range 18 - 24 months no chain Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.