The reason is because they are adjustable ones with screw on plates and the bar that holds the plates weighs 2.5 lbs (I weighed them), so when you put on the weights (I have 3s and 5s) it adds up to some seriously odd weights. Some of them are .5, but I just round up to keep myself sane.
I wouldn't normally have worried about the extra 2.5 with each dumbbell, but I was doing some of my early routines at a gym that had regular 5lb increment weights and I increased too fast one round when I was home and couldn't figure out why, and it was because of the bars.
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