★Tapered rollers are a key addition to your car, helping it clamber down from the course wall if it accidentally gets up there. ★The rollers in this product are 19mm in diameter, and feature built-in 520 ball bearings for super smooth rotation. ★Crafted in aluminum, they are given a stylish green anodized finish. ★Includes two rollers, two screws, and four aluminum spacers.