The proprietary M2CM system is a molding and machining operation that joins two dissimilar materials in a single unified composite structure, and is a key development that makes Zipp's clincher wheelsets more durable than ever. The M2CM process allows carbon rims to be melded with heat dissipating aluminum breaking surfaces in a manner that offers performance integrity. For years this has been a manufacturing impossibility. More than just a rim technology, the Zipp M2CM process opens a whole new area of product development resulting in trouble free rims with perfect braking surfaces.