I recently bought 10 dozen of this ball for practice/multi-ball.
I'm not sure why they are called practice balls, as in my opinion these are top of the line tournament balls. In fact I think they are just as good as the Nittaku 3 star plastic balls. In some respects they are better.
I measured 6 new 3 star, and 6 new J-Top balls and found that the J-Top is more round, and more consistent in size than the 3 star. It's 7% lighter than the 3 star, but it does not feel so when playing. These balls are hard, very lively, bounce just as high, and go thru the air arrow straight, with no visible wobble. They are completely consistent from ball to ball.
They are made by Nittaku for Paddle Palace, using the same plastic as the 3 star. So not a surprise that they would be so good.
I bought them on sale for $76.50, so that's just 65 cents each.
So don't waste your time and money on any other practice ball when you can have the best of the best.
- Dave R, PA