Be in control.
Control the weight of your dumbbells by controlling the amount of water.
Dumbbell Weight: Up to 2.2 lbs (1 kg)
Material: Plastic (RoHS Compliant)
Size dumbbell: L 10 1/4" [26 cm] x H 4" [10 cm]
Width handle: 3 5/8" [9.2 cm]
Price for 1 dumbbell.
P.S. At moments when I forget how much weight I've lost and what tremendous impact it had on my life - I fill my dumbbells with water, put them into my back pack and carry those extra 4.4 lbs with me anywhere I go. Although it is way much less weight than I've lost - it is still a great reminder to myself of the simple fact that this extra weight is now in my back pack instead of my belly.
P.P.S. I also exercise with these dumbbells (for in case you've been wondering :)