Naturally shaped, offset, silicone nipples designed for easy latching and feeding Offset design promotes upright feeding and ensures smooth milk flow down to the last drop Dual anti colic vents prevent burping reduces colic Wide neck is easy to clean Safe in microwave, boiling water, dishwashers and sterilizers 100% Non-toxic silicone, BPA free, phthalate free Age 0-3 months (slow flow)