Select Tech Dumbells I just got these dumbbells at Christmas to use with my ChaLean Extreme workout. I love them because you can increase the weights by 2.5 lbs. When I was using conventional dumbbells I had to increase my weight by 5 lbs. and got injured. Then I had to back off and go back to the lighter weights. Now I am able to keep applying the overload principal and get results. They don’t take up nearly as much room as conventional dumbbells either. I wouldn’t run out and buy these if you have just started a weightlifting program, but if you have been weightlifting for awhile, you will love Select Tech.