Goldring D12GX stylus is designed to fit the current Goldring 1012GX phono cartridge or old model 1010 or 1012, a direct replacement when your stylus is worn - saving the cost of buying a whole new cartridge. Goldring cartridges generally last many hours until the stylus needs replacing. An indication of wear is a "duller" sound. Simply remove your current stylus by carefully pulling it away from the cartridge and replace it with the replacement.