Nice product for pregame batting practice when live BP isn't allowed. Heavy balls force kids to swing through heavy resistance to hit it good which hopefully transcends into their live at bats with harder hit balls. (Posted on 12/10/13)
I love these weighted balls. I used an oversize 17oz ball that was about the size of a cantaloupe, and it helped my son develop a powerful swing through the ball, but it didn't do anything to help him zero in on a baseball-sized ball. This solves both problems.
Kids have a tendency (at least the 10 y/o and under set that I've coached) to slow down their bats when they feel contact. These balls really help them get over that hump and understand that you have to power through -- accelerate through -- the ball at contact. The job's not done at contact. These balls get them there.
Best of all: these are FUN for the kids. They all beg to take swings with the "yellow balls." They may be pricey, but finding something that works AND that is fun for the kids makes it worth the price, IMO. I dropped one star because they're pricey. If money's no object for you, then these are a 5-star hitting aid. (Posted on 12/10/13)