I put it on a Jinhao X750 (~$5 pen), Much better than the Jinhao nib and fun to write with. Note, I have to give the back end of the nib a small squeeze with a multi-too to get it to fit into the Jinhao. I's my second flex nib (the other is a FPR - lot more flex) and it really changed the character of this pen. I ink with Noodler's brown and there was lots of shading. Will keep this nib on this pen for the a while and play with ink samples.