DACT knobs are specially designed to be used with DACT audio switches. All the knobs are made with solid stainless steel with a raw steel look. One important characteristic of the CT knobs is that they are made of "audio gradeﾔ materials. In terms of components that are not used directly in the signal path, but relatively close to the audio signals.
Audio Grade Materials refers to,

1. Non-magnetic
2. No non-linear dielectric loss (like for instance that of certain plastics)

The DACT knobs were designed with the right feel so the perception of the knobs match the quality of our switches. Therefore, of course, low cost plastic knobs were out of the question from the beginning. There is no way that a light-weight plastic knob can match the delicate mechanism of our switches. Which size of knob to choose depends on your preference. The smaller knobs give a more exact clicking feel especially on our attenuators, while the slightly harder feel of our input selectors may favour the larger knobs.