1SUFFICIENT QUANTITY: This set of potentiometer includes B5K B10K B20K B50K B100K ohm single linear rotary taper potentiometer, knob, 25 nuts and 25 washers. They are classified and packaged in plastic bags, and will not be confused or lost. The quantity is sufficient for your daily use or as a gift to friends. 2METAL MATERIAL: The single linear potentiometer is made of metal, without peculiar smell, with excellent workmanship, good style and function, very stable and durable. The pins fit well with the breadboard and are not easy to break. 3WIDELY USED: Used for volume control in sound applications, guitars, amplifiers, speakers, lights, DVD players, household devices, and other devices. 4PRODUCT FEATURES: Single linear, type B, with standard WH148 knob. The values of these rotary taper potentiometer are marked with readable strings to indicate the total resistance for easy identification. 5FINE WORKMANSHIP: Well crafted with fine threads and standard size, these potentiometers and knobs ensure tight fit with your equipment, choose with confidence!