The Dirty Bug Yarn is a double stranded product which can be used straight off the spool for larger flies or split into single strands for smaller flies.
Specially designed with a mix of natural and synthetic materials.
In reality, if you look at a fly or nymph, for example, a baetis nymph it may be olive in colour but it is usually a mix of colours because nature is not monochromatic or single colour.
Each spool holds 5 metres of material.