This is a popular bachi for people who play minyo.
It's the most balanced and average bachi.
There are 3 sizes; for Nagauta, 35 monme and 40 monme.
Momme is part of a table of Japanese units.
For Nagauta
length: 192mm
width: 106mm
weight: 130g
35 monme;
length: 195mm
width: 95mm
weight: 160g
40 monme;
length: 205mm
width: 110mm
weight: 180g