I be a 59 year old woman and I be not sure if I would like they but go ahead anyway . I just love they , they be great and I have no regret whatsoever . I would recommend they to anybody . there be a 15 year warrenty on they . I usually workout on a bowflex but these feel like I have do a much better workout . I buy the rack too and I think it be a plus . with the rack the dumbbell be at just the right angle to get a good grip and it be much easier to set the weight desire . I be afraid they would clank together and make a lot of noise but they do not . they feel like solid weight , nothing move like some dummbell I have try before . it be very easy and fast to select the weight desire . I only wish I have buy these before my bowflex gym . I like my bowflex but it do take a lot of room . a set of powerblock and a bench would be all I need to keep in shape . oh well live and learn .