"100% Plastic-free & only Non Toxic Certified bottles. One Life, One Bottle concept. Bottle can be converted into a straw, Sippy or small water bottle by swapping with another Pura Silicon lid. #304 stainless steel & Medical Graded Silicone accessories. Dishwasher safe, shatterproof. The safest infant feeding bottle on the planet! Our award winning 11oz Kiki infant bottle is 100% plastic-free, environmentally progressive, and adapts to the needs of your growing child. Both the bottle and nipple collar are crafted from safe, high grade #304 stainless steel and our Natural Vent Nipple™ (medium flow) is made from medical grade silicone… so you can be sure that you are truly using a 100% BPA/BPS-free and toxin-free feeding system. Internal volume markings make measuring your child's milk or other beverage a snap. Each ounce is marked and can be seen by glancing inside the bottle. Dishwasher safe and shatterproof."