This is a monthly subscription box that will be sent out on the 25th of each month. This box will contain the materials to tie 1-2 dozen of the monthly fly as well as a few bonus materials which will make interesting. This will give you new and exciting materials to add to your bench. If the monthly fly is a big streamer it will have 1 dozen, otherwise you will get the materials for 2 dozen flies. This is great for the seasoned tyer. The material kits in these boxes will be for advanced technique flies; large streamers, advanced technique dry and nymph flies.