This is a large plastic shell that covers a wii remote.
You can use bare remotes or wii motion plus remotes, and add external nunchuk.
This is just one of the many crazy controllers for the wii to play games such as tennis, golf, baseball, fishing, racing, shooting games and more.
There was also a bowling bag carry case for your wii.
Sources:
Amazon for release date: https://amzn.to/3eH3mb6 (Affiliate link)