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.