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While the general mechanical design and function of synchronized manual transmissions has remained fairly constant over the years, incremental improvements of all components - gears, bearings, seals, synchronizers, and fluids - continue to advance the quality of the product. The improvements are generally driven by marketplace demands aimed at durability and shift quality. The synchronizer and fluid are two design components that can affect the overall performance of the transmission as observed by the end user. In recent years there has been a variety of synchronizer materials from brass and molybdenum based products to include Sinter compositions as well as phenolic materials-particularly in Japan. Each composition affords the designer different wear and durability properties. For example, although the Sinter is a Cu based alloy like the brass; fluid response is not necessarily the same.