Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Apex Threaded Dumbbell Handles

The handles are nice but I was expecting the rubber to be fixed over a solid center. Instead it is a thick rubber piece that slides over the threads. I just hope the rubber doesn't break due to the pressure of the weights when you tighten the nuts. Also the nuts have sharp edges that can cut your skin. I got a minor cut myself. It would be nice if the manufacture made a better smother finish on the nuts and if the handles should have had a solid higher center covered with rubber so that there would be no pressure on the rubber possibly minimizing it's useful life span.