These carburettor base gaskets are made from a durable, heat-resistant nitrile rubber compound material. Each gasket is precision die cut for excellent seal and fit. Designed to suit 4150 4-barrel throttle bodies such as the Aeroflow AF64-2250/AF64-2250BLK. They can be trimmed if necessary for various applications. Eachgasket is 1/32" (0.90mm) thick. Sold individually.