Sai Skill

after reading the skill description several times, i am confused as to what this skill does exactly. all my searches tell me is that it is a weapon, not a skill? it seems to me, that the skill makes it easier to learn a specific weapon, in my case, shurikens.

for the 83 people that viewed, but had no idea either what the Sai skill is, it is NOT a skill, but a weapon. if you would like further explanation, just ask. i got the REAL POOP from ICE.