This is a golf swing training bat. I used it to adjust my swing before rounds or practice, but I've purchased a heavier one, so I'm selling this. The weight is about 600g to 650g. After swinging this bat 10 times, I was able to hit the ball with my driver and gained over 10 yards. It depends on the person, but it seems that swinging a heavier bat and then a lighter one allows you to hit with good power. If you're interested, please consider it. The grip is clean.