Which MA uses sai?

[unknownstyle]

okinawan styles

[Zaine]

Kabudo, Shorin Ryu, Ishin Ryu, and a lot other japanese systems, ecspecialy okinawan systems

[Why_Worry]

Yeah, most okinawan based styles incorporate one or a couple of sai katas, but if you really want to learn just sais i recomend doing kobudo. In the style i practice which is wado ryu we eventually learn a couple of sai katas which are required for black belt ranks past shodan although i havent reached that yet so i havent started but i have seen people practicing them. If your not a black belt wher ei go your not allowed to practice any bladed weapons. Although styles liek wado ryu and shotokan even though they arent exactly from okinawa they use sais because they branch from gichin funakoshi who learned okinawan karate then went to mainland japan which is why they technically count as mainland japan arts.