Zero Plastic… Zero Yuck ™: Bottle and collar crafted from safe, anti-bacterial, #304 stainless steel and Pura XL-Sipper Spouts ™ crafted from 100% medical grade silicone; BPA-free, BPS-free, PP-free, Polypropylene-free, phthalate-free and will not leach toxins like plastic bottles and lids because our products do not contain any plastic!