These handles are really well made and sturdy. I didn't get them for resistance training - well not for the kind they were meant for - but I got them to put on the end of my dog's leash to stop his resistance and pulling. One thing I didn't count on was that I am an old grandma and have small delicate hands. My hands are usually tatting lace, knitting, crocheting, or quilting delicate things, and these handles are meant for hands like Brutus - a big strong man with huge hands. After I get my little hands halfway around the handle, I really have no grip. They need to be slightly smaller. They are excellent, though, but whoever made these didn't make them for regular size women's hands, but for men. I will give them to someone else to use - waste not, want not!