Polyamide, a very special material!
If the need to use a color is very small or you use Knot-Filler for DIY purposes, there are two packages with mixed material colors.
In the Mix 1 package, you will find two knot filler rods each, in the following colors:
Pine, Knot, Oak, Mahogany.
In the Mix 2 package, you will find two knot filler rods each, in the following colors:
Ash, Beech, Walnut, Black.