G-10 is a very durable reinforced material that is made up of fiberglass soaked in resin, then highly compressed and baked. This process makes it impervious to liquid and physically stable under extreme temperature fluctuations. G-10 is most commonly black but is available in various colors, and typically includes a non-slip finish.
Micarta is created from soaking layers of linen cloth in resin, then pressing them together, much like G-10. It is available in various colors and can be worked to a very smooth finish.
Natural Materials include bone, wood, leather, and more, offering a more traditional look. These are typically applied directly onto the liners of the knife.