Comotomo Baby Feeding Bottles With Replacement Silicone Nipples-Green Bundle pack contains 2 five ounce(150ml) feeding bottles, 2 eight ounce (250ml) feeding bottles and 6 silicone nipples of slow flow, medium flow and fast flow each. The feeding bottles features an innovative, logical design to closely mimic natural breastfeeding. Made of silicone, the naturally shaped nipples are soft and ideal for babies who have difficulty transitioning from breast to bottle feeding. Your little one may love holding on to its soft, skin-like body unlike any other bottle in the world. The bottle features a wide neck design, for brush-free, stress-free cleaning. The bottles is equipped with an innovative dual anti-colic vents that are cleverly designed to prevent colic, while completely eliminating annoying leaks. Quite possibly the most thoughtful bottles ever. Naturally designed, squeezable, skin-like softness makes the feeding bottle ideal for breastfeed babies easily and the innovative, leak-proof and anti-colic vents with unique interlocking feature and drip-free, wide neck design allows the cleaning an easy task. The Comotomo Natural Feel Baby Feeding Bottle Green/White is safe for microwaves, boiled water, dishwashers, and sterilizers.