It’s construction is a cross between a floss and a thread which means it can also be used for tags, tails, hot-spots, wings and heads. It is easily twisted tight or loose and split to insert whatever dubbing-type material you might want to bind down.
Small (49m per spool) = All Colors
Medium (36m per spool) = M01, M02, M08, M09, M10, M11 & M14
Large (30m per spool) = M01, M02, M10, M11 & M14
Fluorescent Colors = M02, M10, M11 & M14