I'm not a gym girl. I prefer to work out in the privacy of my own home and am a fan of fitnessblender.com so when I saw them using these gems I knew I had to score me some. I have a pair of 5lb weights, a pair of 10, a 12 lb kettle bell and was about to acquire some 15's and 20's and in my tiny flat they'd be stacked all over the place. The geniuses at PowerBlock have put a series of weights all nice and compact in a pair of dumbbells. All you have to do is switch out the weights with the slide of a pin. Such a space-saver that it's perfect for those of us who don't have a small floorplan or apartment. Dear Santa....