Polished stainless. Fits in combination with smooth top fuel tanks with 96-up style fuel caps. Polished stainless steel. Used on the area around the filler neck to prevent gasoline(vapors) to get under the paint where it causes bubbles, chipping etc around the fuel filler area. These paint protector trim rings create a seal inside the filler neck to help stop the problem where it starts, and looks good doing it. No special tools required. Order 2 for dual cap gas tanks.