Pigeon plastic nursing Bottle KP40 is sturdy and durable and is made of 100 percent BPA free safe plastic. The ultra-soft silicone rubber with double thickness ensures perfect softness and elasticity so baby can latch on easily and comfortably. Also, the shape fits perfectly with your baby's tongue bestowing smooth tongue movement while minimizing air intake. The nipple's roomy base helps your baby to open his mouth widely thereby encourageing steady peristaltic motion.