Beans-Shaped Bottle Cleaning Sponges - Set of 2 Cleaning Reuseable Water Bottles And Plastic Bottles Has Never Been Easier Simply Drop The Sponges Into The Bottle, Fill With Water and A Dash of Detergent, Close The Cap and Shake It Up Alumina Ceramic Balls In The Beans Adds Weight - Cleans Inside The Bottle In Just A Few Shakes Heat Resistance: Up To 158 Degrees F/ 70 Degrees C, Weight: 0.0875 pounds, Manufacturer: Marna