The Timbre Series Platinum3 cartridges offer a low mass generating system, and a diamond cut specially for Grado. The Timbre Platinum3 uses a modified four piece OTL cantilever technology achieving a 10% tip mass reduction over the Prestige series and ultra-high purity long crystal (UHPLC) oxygen free copper wire in the coils. The Platinum3 model uses Grados specially designed elliptical diamond mounted on a brass bushing. The Timbre Platinum3 cartridge is 1/2" mount. 78 RPM styli are not available with this cartridge. All re-tipping on the Timbre Platinum3 series will be done through 4OurEars.