Bottle is made from Polypropylene (PP) material which is durable and lightweight Allows baby to use natural motion learned at the breast Peristaltic Nipple is ultra soft and flexible to allow for natural and smooth tongue movement Air Ventilation System (AVS™) provides smooth and stress-free drinking Super Soft & Elastic Silicone Nipple Color Red: Nipple Size: L Round hole 9+mos BPA/BPS Free Bottle Net content: 240 ml/ 8oz Recommended age: Color Red: 9 months and up Pigeon RPP baby bottles are made of Polypropylene (PP) material which is light for those little hands to grasp. With its ultra-soft silicone teat, this helps your little one gently transition from breastfeeding to bottle feeding. No stress for mommy and no nipple confusion for baby. Recommended by Pediatricians and Childbirth Experts worldwide. Celebrate babies the way they are and give the best quality feeding bottle.