If you have a tennis racquet, it probably has a grommet set!

A grommet set consists of several pieces of molded plastic designed to fit a specific racquet… a particular racquet.  But why?

The materials used in modern tennis racquets are very strong and can be very sharp where the holes are drilled into the frame, so the swing can be installed.  Without the plastic protection, the string could slice through the fiber or the fiber could slice through the string, and neither one is good!

Here is an example of extreme grommet wear.