Flybox Medium Crystal Hackle is a 10mm single sided synthetic which is deisgned for tying cutting edge trout flies - though it can also be used in Salmon/Pike Flytying. Crystal Hackle swims like marabou providing a lifelike movement to the body of your flies. The core is very slim allowing you to tie neat bodies, unlike most synthetics which are 'rope-like'. We've dyed these into essential colours for the UK. Each pack contains a generous 3 metersof material!