This genuine carbon fiber block-off cap is made by Artisan Research in the USA. The cap is domed for a finished look. Fits 6-bolt steering wheels with a 2.15" (54.5mm) center cutout. Compatible with Momo, Sparco, Driven and OMP steering wheels, this product is an effective solution to fill the void of the horn button area created by the use of a quick release device on your steering wheel.