Kunai
The kunai shape are very basic.
There is also the assortment of paper bomb kunai.
The idea behind the seal is to house at least 100 or so swords in it to either distract the enemy, or to kill them in one blow. It is the same concept as ten tens dragon scrolls, but dimmed down to a much more simple form. The kunai will also still be in the bunch of swords, so even if the swords miss, the kunai will still come at the opponent. As the Kunai are fired, they have wrapped around the end of them, string. So that as they fly it will wrap around the opponent that it is firing at.