High-Quality Construction:these knobs a solid grip and a long lifespan, perfect for professional and home audio systems. Compatibility: these knobs are suitable for most potentiometers and encoders on sound cards and amplifiers. Versatile Use: perfect for various applications, including volume control and power amplifiers, providing precise adjustments. Sleek Design: The cap features a sleek, modern design that enhances the look of your audio equipment without sacrificing functionality. Due to different batches, there may be differences in product appearance and printed text, which do not affect use. Colour:Black Material:ABS Size:12 x 6MM Package Contents: 20 x Knob Cap Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.