DS Audio ST-50 Pickup renserThe ST 50 utilizes specially designed urethane gel previously only used in industrial clean room conditions, such as semiconductor manufacturing. In a clean room, it is used to absorb particles at a micro level. The urethane gel seems to pick up more dirt from the stylus than the ZeroDust, which uses just a simple piece of silicon. The ST 50 is very gentle on your stylus, with no extra force or pressure being applied to it. With ZeroDust you push the