This wire is great for smaller nymphs (20-16) and can be ribbed through anything. I fish all colors of this on my PT variations and dry flies.

Here is what Semperfli has to say-” is an ultrafine fly tying wire, non tarnishing and can be used for even smallest dry flies. Our Wire 0.1mm Copper is very small and fine just 0.1mm or 0.004 inch diameter and ultra light weight. It is part of our large range of wire colors suitable for most flies from March Brown to Mayfly patterns.

Having developed and manufactured our own computerised spooling machinery Wire 0.1mm Copper is put onto the spool with touching turns in totally level traverse, why is this important? With Wire 0.1mm Copper you will not get a birds nest when tying flies or have wires trapped. Our spools have a removeable cap to re-trap the wire once you have removed a section to tie your flies.