Safe For You Non-Toxic Earth Friendly Materials Replaceable Brush Head Certified B Corporation A perfect fit for on-the-go drinking bottles and mugs. Slim, elongated design that's ideal for bottle necks. Replaceable heads extend use while minimizing waste. A double agent in scrub brush form. This bristle-packed scrubber does its best work out of sight, keeping the insides of your favorite bottles clean, bright, and oh-so drinkable. Safe For You - Non-toxic coating on bamboo. Earth Friendly Materials - Nylon Bristles, Bamboo, Recycled Plastic. Intentional Design - Replaceable brush head stands on end for quick drying and easy storage. Tougher top bristles for corners. Square brush head easily cleans sides and bottom of bottles and glasses.