Our mulch is grinded twice, thus it’s commonly referred to as “double-hammered” mulch. The grinders have screens that act as a type of filter in the production process. Natural brown is finer, smaller mulches because of the size screen that is used. Rustic brown is slightly longer in size than natural brown. The painted mulches use a different size screen because larger pieces of wood are needed so the dye can adhere to the product better.