CAB (Cellulose Acetate Butyrate) was the material that knobs were made from back in the day and our CAB knobs have a slight yellowing, embossed numbers hand filled with tinted white pigment and are hand polished with rolled edges. 

CAB has a more clinging feel compared to the more slippery feel of modern acrylic.

If you have been looking for those Vintage look and feel knobs then these are for you.