Resin Bonded Plastic Media is made of small, angular, or spherical-shaped pellets that are typically made from thermosetting plastic resins, such as polyester or polyurethane, that are reinforced with abrasive particles, such as aluminum oxide or silicon carbide. The resins provide the strength and durability of the media, while the abrasive particles provide the cutting action to remove material from the surfaces of the parts being finished. Resin Bonded Plastic Media is a popular choice for finishing parts and components.