Zoot's racing membrane comes with carbon membrane plates, which means that the plates are light, flexible and strong. These properties mean that this membrane works significantly faster than a standard one and does not become a "bottleneck" where the membrane potentially "starves" the cylinder.
If you miss a membrane that can feed your sport or racing cylinder and that can keep up with higher revolutions, then the Zoot Racing membrane is definitely an excellent candidate.
Note: Delivered incl. membrane plates.