This is a simple and functional solution from Yinhe, which gives your handle an original outlook and it also guaranties to you a perfect feeling.
It is an oversized tube, which shrinks when heating. For heating you can use a powerful hair dryer or a lighter (very carefully).
YINHE Milkyway Grip allows you to make a handle a little bit thicker and also add some more control due to changing the position of centre of gravity. Also YINHE Milkyway Grip allows protecting the handle of the bat from external unfavorable conditions.