Rain Rail (Gutter) funnels water that runs down between the body of the car and the top to the drainage holes. Made out of 100% polyurethane. Lifetime Guarantee - provided installed factory instruction manual. Very flexible, won't crack like original rain gutters Located behind top, only seen when top is removed. Rain rail only not attached to a top! Will work with all OE Style Miata tops. Mounting hardware & installation instructions included.