FITactic Rock Climbing Solid Training Cannonball Bomb Pull Up Power Ball Hold Grips for Straps for Finger, Forearm, Biceps, Back Muscles

these ball are really great. They are strong and will def improve grip strength. I have them wrapped around a steel beam in my basement and used them with 1" nylon webbing. They are really great. Could not figure out how to use the straps that came with it but using nylon webbing and that works really great. Love these balls and would highly recommend.

I wish I hade these 20 years ago. I have to wear movers gloves, so I don't slip off. No other hand, wrist, forearm training tool does what these do. If you're worried about the difficulty, buy some crossfit WOD bands to assist with your pullups.

Purchased the 4" version.First they did not come with the stainless steel hanger hooks mentioned in the description.Second and most importantly, the problem I have is that one of the cannonballs is sphere and the other is more like an egg shape, not sure how it passed the quality inspection, but surely someone did a terrible job trying to fix it. One of the cannonballs instead of being rounded all around, one side is slanted. This is something I can definitely feel while working on holds. Seems as if there was a problem with the molding process and instead discarding the unit, they tried to add some resin to fix it, but did a poor job sanding leaving a bump and a slanted side in the process. There is a 24 gram difference between each cannonball, due to this poor fixing.Also, they desperately need some additional finish texture, they are VERY slippery, without some sort of chalk on the hands they are almost to the point of impossible to grab, not due to their size.Not sure of what material they are really made of, could be some kind of resin, I could not find this info on the listing or the web, neither about the maximum load capacity. Even when they feel sturdy, they also feel as they could break if accidentally dropped on the floor.On the plus side, the color I received was matte black and not the shiny black as pictured (this is a good thing, as finger prints are less noticeable).

They seem to be made well. I am a 29 year old woman with smaller sized hands, so I wish I would have bought smaller sized balls, but they still work.

Having this for awhile now, and is been helping me with my grip strength.

These babies will definitely increase your grip strength albeit a little slippery. Nothing some chalk cant correct.

I like this product. The only thing that I do not like about it is the way that it connects to the bar. It is tough to get the Velcro through the loops without it sticking. It is strong Velcro, but it also worries me that it might not be able to hold heavy weight. However, I have had no issues with it yet.

Easy to use in the gym, good on gripping the ball.