These are Metz super quality genetic saddles.
As usual they are graded according to the quality of the hackles in terms of approximate hook gauge and length.
#1 – suitable for tying size 12 or 14 flies; #2 – suitable for 10 – 12 gauge flies #3 – larger lures etc..
They hackles are also ideal for lures and streamers.
There are some large feathers at the top of the saddles that could be used as Schlappen hackles.