Leather grinding: the leather surface is polished, and the grain surface scars or rough fibers are removed, revealing a neat and uniform leather fiber structure, and then dyed into various popular colors.

Denim leather: Also called suede leather, it is the first layer of leather made by grinding the surface of leather blank into suede and dyeing it with various popular colors. Many materials can be made into suede, both genuine and artificial. Look at the materials! I still like icing!