I prefer to tie them on Demmon DGS 900 – a light barbless hook that I like for my delicate flies ( not only for small terrestrial flies like small ants ). For body I used thread , for wings I used tips from rooster hackle and for hackle I use genetic hackle or CDC.
I recommend these flies to be used when you want to fish with dry flies but there is not a hatch to provoke feeding of trout or grayling in surface of water. Also are excellent after a short Summer rain when level of water is rising and is washing the river bank. Then a lot of terrestrial insects are washed away and fish start hunting close to the river bank. I hope that you like these flies and these few info helps