What is the rosin bag used for in baseball?

A new baseball has a smooth finish, such that it can slip off your fingertips as you throw it - much like trying to pick up a single sheet of paper with dry fingertips. read more

The Official Baseball Rules (OBR) does not require umpires or teams providing baseballs to to “rough up” or “rub in” the balls before putting them into play - though most do. The chief umpire is required to provide a rosin bag for the pitcher’s use, to be left behind the pitcher’s mound during play. read more

As with baseball, even ten-pin bowlers use the rosin bag to improve the grip, and it can be used both on your fingers or in the three gripping holes. Bull Riding or Rodeo During rodeos, the most important thing for a rider is to maintain his grip, and this is what the rosin bag helps with, and can be used both on the gloves as well as the ropes. read more

Baseball pitchers and ten-pin bowlers may use a small cloth bag of powdered rosin for better ball control. Rosin can be applied to the hands in aerial acrobatics such as aerial silks and pole dancing to increase grip. read more