Yuhei used a bat that weighed 890 grams in 2017. He started experimenting with other bats after he suffered a fractured hamate in his right wrist in late June. One of the bats he tried that he liked was a Norichika Aoki bat that weighed 910 grams. He plans to use the Aoki bat in 2018.
Source: Nikkan Sports 1/1/2018