This accessory is for the Airfix, Hasegawa, and Heller Draken kits. The parts are replacement pitot tubes and an Angle of Attack sensor.
The Kit
You get three finely done brass parts in a plastic envelope, which is inside another plastic envelope. I found that the pitot tubes were in a separate tube-like pouch, with the AOA probe in a separated part of the inner plastic bag. I had to cut the bag twice to get the parts out.
I liked the instruction sheet, it was simple, and showed you exactly where to put the pitots and the AOA.
Assembly
This particular model had the tail pitot intact, but the nose one had been broken off long ago. I cut off the tail pitot and drilled a small shallow hole. The nose pitot required a little cutting to get the taper of the pitot to match the nose part.