The handle is made from sustainable bamboo and this brush has rough, plant-based sisal fiber bristles. This brush is perfect for getting into coffee mugs, wine glasses, jars and bottles. Hang your brush, or store in a jar bristle side down, to keep water from pooling on the handle. Most bottle brushes are made of plastic and are not biodegradable. • Replaces plastic bottle brushes • Compostable (remove wire under bristles first) • Vegan