RIBtype rubber stamps are most commonly made from natural rubber that has a red-orange printing face and gray ribs that set it apart from other brands whose ribbed type is often made of solid gray rubber. Although natural rubber is the best choice for a majority of stamping, In certain applications, there may be a better choice. Aggressive inks, harsh environments, marking on heated materials, and other factors may make a different material more suitable for your RIBtype needs.