This billet reservoir is great for car enthusiasts who own an EK Honda Civic, '98+ DC Acura Integra, or 2000 - 2005 Honda S2000. It's used when you want to upgrade the look and quality of your engine bay. It fits perfectly into the stock master cylinder and uses the existing hold - down bolt for installation. Although specific size and weight aren't given, it's designed to be a direct replacement for the original plastic reservoir.