This Top Marker D-Shaped wheel features our combination of Diamond Vinyl/Smooth Vinyl Grip for a "Sure Grip" feel. It also features two holes to mount 11/16" sized switches. The holes are shipped with plastic plugs just in case you only need a one button set up. This wheel does not come with a horn button or part number 4000 GT Styling sleeve. It was designed to be used with our Racing Quick Disconnect Kits. If you want to put this wheel on a street car you will need to also purchase a 4000 Styling Sleeve and a 5898 Horn button or a similar Signature Series Horn Button and of course an installation kit.