Headlessknight responded to my Rod references to the Millennium Rod I plan on making with a needle blade with these two pictures depicting knife blades. 
These are good quality shots and I must credit them for responding with them (Sadly tumblr won’t let me reblog what they posted with for whatever reason, silly tumblr.) and am debating on if I should make two kinds just so I can have the needle one and the knife one.
The knife being consistent with the manga and the needle being more consistent with the anime (Because different artists on the anime couldn’t seem to keep it a needle like it was for most of the shots it was out.).