Emerson Pro Pots are custom made by CTS to Emerson's exacting specifications. What makes their pots different than other CTS variants on the market? ALL of Emerson's pots are hand metered to ensure that they meter within their advertised +/- 8% tolerance of the 250K or 500K resistance. Emerson Pro Pots are low torque and feature a proprietary custom audio taper that they designed to maximize response (you can turn down all the way to 2 and its like you just turned down your amp).