We use a shorter and lighter sword than most other styles.
Kawabata Sensei believes that the ideal dimensions of the sword for Ryushin Shouchi Ryu is:

Length 27” (68.58 cm)
Weight 1.6 lbs (725 grams)
Sori 6/8 inches (1.9 cm)

MEASUREMENTS
1 SHAKU (尺) = 11.93” inches
1 SUN (寸(すん)  = 1.193” inches