The handle is made from sustainable bamboo, and the bristles are plant-based fiber for a scrubber that is fully compostable at the end of its (long) life. The medium scrubber works for most dishes and glass ware. The coarse scrubber is for tougher scouring jobs on more durable surfaces such as cast iron, heavy ceramic, and stainless steel. Store brush bristles down to allow it to dry out after each use. Scrubber can be placed in boiling water for 1-2 minutes to clean, as needed.