Come and Check Our Branding Solutions.This Bottle is made high quality Polypropylene Materials and is made of 316 surgical-grade stainless steel. 3.8 OZ. There is a screw-on lid creates leak-proof seal, and flip cap snaps securely shut to keep contents container. The loop top for easy carrying or attaching keys. The wide Mouth designing make it easy to add mix scoops and liquids and embossed markings measure both ounces and milliliters. It is wildly used for mixing protein shakes, smoothies, and supplements. Pls check inventory and detailed info before placing your orders.