There are two nibs included in the starter kit: a Nikko G nib (which I consider to be the best pointed pen nib for beginners; read why here) and a Brause EF66 nib (my personal favorite nib). The straight pen included in the kit will accommodate both the Brause EF66 and the Nikko G nib. The oblique pen included in the kit will only accommodate the Nikko G nib plus a smattering of other nibs not included in the kit (Leonardt Principal, Zebra G, Brause Steno). It will not accommodate the Brause EF66 nib. The shank on the EF66 nib is very small, and for that reason, oblique pen flanges for it have to be custom-made from a strip of brass. If you enjoy using the Brause EF66 in your straight pen, you can buy a Brause EF66 oblique pen when you're ready.