A new synchronizer blocker ring has been developed and investigated. Paper-based organic friction material is used as lining on a cold-formed sheet metal core. The many different friction materials which are well established in automatic transmissions also meet the different requirements of modern manual transmissions. Optimized lining/core combinations fulfill high performance and durability needs, show excellent oil compatibility and improved shift comfort at low shift forces. Low wear and low thermal expansion rates allow multi-cone synchronization systems on the basis of a low cost ring design.