The top blank is deer antler. The nib is from a slimline and the finial and clip is from a CSUSA deco european kit I really like the finial on this kit and on their presidential kit as they have a spring loaded clip. The nib from the deco european kit has too large of a diameter to mate up smoothly with the cartridge a slimline works perfectly. So I will use the nib from the deco the next time I do a gold slimline.