"• 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. • Internal marking makes you measure child's milk or other beverages. Each ounce (appx. 30g) is marked & visible at a glance inside the bottle. • Dishwasher safe, shatterproof. SAFE: only 100% plastic-free bottle on the market; only NonToxic Certified bottles on the planet Baby Grows… Bottle Evolves: This bottle easily converts into a sippy bottle, straw bottle or sport/water bottle by simply swapping the nipple out for another Pura silicone lid Crafted from safe, anti-bacterial, #304 stainless steel and medical grade silicone BPA-free and will not leach toxins like plastic bottles and rings Wide neck medium flow Pura Natural Vent Nipple crafted from 100% medical grade silicone (patents pending) 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. Compatible with wide neck nipples from Pura, Medical grade silicone bottle sleeve Medical grade silicone nipple cover Dishwasher safe and shatterproof. "