The Philips Avent ultra air pacifier for babies 6-18 months is designed with a lightweight, breathable shield for baby’s sensitive skin. Four (4) extra large holes in the shield allow for maximum air flow, so skin stays drier while soothing; 84% of moms agree!* 98% of babies accept the nipple, so you can feel confident with this choice. Comes with 4 pacifiers packaged in 2 sterilizer / carrying cases that can be used to sterilize them with water in the microwave and transport them