Amazon.sg:Customer reviews: AbraFit Climbing Pull Up Power Ball Hold Grips with Straps Hand Grip Strength Trainer Exerciser - Durable and Anti-Skid Design - Ideal for Bouldering Pull-up Fitness Workout - Free Carry Bag Included
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Provides a challenging workout and feels safe an solid with one exception. If you twist the balls they can come unscrewed. Its my fualt i should checked that better but be aware. It can happen. Just keep an eye on the threads as over time its possible to slowly loosen them by using them normally.
The balls tend to compress when used to pull, then then nut holding the ball to the strap loosens. If they get too loose they have a tendency to fall apart under load. A little loc-tight helped with the issues I was having for the most part.
I like the ball grip, wish these were a little better quality.