After the first order of non-ProMax handlebars which were perfect, I worried every day that one day a more resistant version would arrive! So it arrived, I didn't think twice and immediately bought them both. Two versions are perfect but the ProMax is safe and gives you more peace of mind to increase a little more weight on the dumbbells, perhaps those weighing 40kg and up! I sincerely thank Kensui Fitness for this wonderful opportunity!