Enjoy my design of the Kunai used in the anime Naruto!
I've looked through numerous sites for a Kunai file that looked accurate to the anime and was comfortable in the hand. Granted, any designs in cartoons/anime will vary from episode to episode.
I used the attached photos from the anime as a reference. I wanted it to fit in an adults hand, (my hands are fairly large). I also wanted to create a design that was strong, most designs I've see seemed weak at the transition points for the blade and rings from the handle.
I have both a single piece file and file for multiple parts for assembly. Use a bit of super glue to hold the part together securely. When its sanded and painted, I use white medical tape for the handle and I weather it a bit with black shoe polish.
The Knife when assembled is 285mm long and 45mm wide. (11-1/4" long and 1-3/4" wide)
The author hasn't provided the model origin yet.