if you be look to get adjustable dumbbell , these be the one to buy . they be solid and will last a long , long time . I would buy these over the bowflex or any other adjustable dumbbell . I have the set that go up to 90lb . and they be great and only take up a little space . I would recommend go to a place that sell these and take a look before you buy . I be look to have a store close by that sell these and I be skeptical at first but when I play around with these dumbbell , I find out just how `` solid '' these thing be . you can get a total body workout with just these and a good weight bench . some thing you just need to try out before you purchase and I try these out and be very impressed . great design and great product . it be funny because after I go to the fitness store to look at these , I go to the local bookstore and be skim through the latest Sports Illustrated magazine and there be a article about Lance Armstrong 's comeback and several photo of he work out . one of the photo show Lance use these PowerBlock dumbbell . after that I be sell ! it must of be a sign . ha ! well good luck and I think you will really like these and may be the last dumbbell you ever buy . good luck !