The Thinkbaby'stainless Steel Baby Bottle is made from 304 (18/8) medical grade, ultra-polished stainless steel. The logo and measurement indicators are laser-etched into the surface, so they won't wipe off. The extra soft, medical grade silicone nipple mimics natural breastfeeding, and is cross-cut to reduce spillage and instances of colic. All Thinkbaby feeding products are free of BPA, lead, and other harmful ingredients, and are also cruelty-free. Comes with a travel cap that protects the nipple from bacteria. Dishwasher safe, top rack recommended.