The Jason Markk Durables Standard Cleaning Brush has a stiff bristle that is excellent for cleaning durable materials. Not recommended for delicate materials such as premium leather, suede, nubuck, cotton, knits and more. - Stiff Bristles - Great for Durable Materials - Strong Scrubbing Action - Use Wet - For use on footwear: durable leather, rubber, plastic and more - The box packaging is constructed from partially recycled material.