Head Diameter Size
| Size | Head Diameter (cm) | Head Diameter (in) |
| 1.3 shaku | About 39 | About 15 |
| 1.4 shaku | About 42 | About 17 |
| 1.5 shaku | About 45 | About 18 |
| 1.6 shaku | About 48 | About 19 |
| Size | Head Diameter (cm) | Head Diameter (in) |
| 1.3 shaku | About 39 | About 15 |
| 1.4 shaku | About 42 | About 17 |
| 1.5 shaku | About 45 | About 18 |
| 1.6 shaku | About 48 | About 19 |