As effective as it is unique, the patented BlenderBottle by Sundesa, will effortlessly mix lump-free protein drinks, nutritional supplements, and meal replacement drinks. It is also great for mixing eggs (omelets, scrambled, French Toast), pancake batter, gravies, homemade dressings and marinades, pudding, yogurt smoothies, and much more! It also works great simply as a water bottle. The key to this unique product is what's inside. It's called a BlenderBall. The BlenderBall is made from 316-grade (surgical grade) stainless steel and electropolished to remove impurities and give it a high-luster shine. The product is stylish, easy to use, easy to clean, and simply the best portable mixer on the market. Warning: Not for use with hot liquids. Hot or warm liquids (and other ingredients such as pancake batter, soda, etc.) may build up pressure within the bottle and cause flip top to open unexpectedly and spray contents. Open with caution.