REPLACEMENT GRIP or OVERGRIP?
Generally, there are two classes of grip wraps: Replacement grips and Overgrips.
Replacement grips, or re-grips, are self-adhesive and are installed directly onto the bare handle material (for example, wood, graphite or foam) replacing the racquet's original grip wrap.
Overgrips are generally not adhesive and are placed on top of the base racquet grip. Easier to install and remove than self-adhesive replacement grips, an old overgrip can quickly be changed between games in a hot match.