Metal knobs custom made for the Sage Sound 3u and 5u preamps.

£1.50 per knob, add as many as you need.

A full set for the 5u is 63 knobs for the front.

A full set for the 3u is 42 for the front and 5 for the rear, 47 total.

Photos here: https://www.sagesound.co.uk/knob-photos