This weapon has reach, and extends the user's threatened area out to two squares, but it may be used within one square. The lajatang is a short staff with crescent-shaped blades on either end. It requires special training to use, and allow a monk to use his more favorable number of unarmed combat attacks. The sai is a blunt weapon with side prongs that can be used to trap opponents' weapons. It had its origins as a farming tool, and is one of the monk's special weapons, allowing her to use her more favorable unarmed number of attacks and other modifiers.
Monks are proficient in the sai without further expenditure of feats.
As light weapons, sais are also often used in pairs.