Additionally, while the nylon filter bags included in the kit work well ... for those looking for a reliable and easy-to-use rosin press. We were impressed with the DABPRESS Upgraded 6 Ton ...

But no one had done a scientific study on the differences in the rosin bags used by pitchers in the two leagues until now, according to Takeshi Yamaguchi, a tribology professor at Tohoku University.

Rosin bags — those white bags you see on the back of the pitcher’s mound and in on-deck circles — are filled with rosin powder, which is a sticky substance that comes from the sap of trees ...