The Polini 19mm suction kit is with diaphragm housing and studs made of aluminum and is for use with a 19mm carburetor. The design and the included membrane with a larger suction area, both durability and performance are raised compared to the original suction. The membrane in the kit, unlike the original membrane, is equipped with carbon fiber membrane blades, which are both stiffer and more durable than the originals. At the same time, there is no risk of the engine being damaged if they break, which is a risk with the original ones - especially on tuned engines.