Are you interested in improving your grip on the bar? Try one of the US Gloves Gymnastics Grip Brushes.
Gymnasts are particular about how their grips feel on a bar, often times gymnasts will use a brush on their grips in order to prepare the surface of their grips and create a stickier feel on the bar. Brushes can also be used to clean chalk residue from the surface of the grips.
*Avoid brushing the stitching and wrist/buckle area of your grips*