Features: 1. Food grade silicone. 2. BPA free, bps free, phthalate free, PVC free, non toxic, non leaching, non metallic taste. 3. Dishwasher safe (rated -40 to 500 degrees). 4. Great for use with tall glasses, thermos, keg mugs, stainless steel water bottles, blender glasses, mason jars and more. 5. Great for use with smoothies, coffee, tea, festive cocktails, children's bottles. 6. Not for use in microwave. Also great for use in car thermos or water bottle or for athletes who prefer a non metal/non plastic reusable straw. Silicone straws can be foldable for travel, storage in pant pocket, purse, gym bag, sealable water bottle, lunch box, etc.