It seems to be that the weights are all wrong. Having a look in the information section, hardshell comes up as weighing 8.9 pounds. Which according to a handy online weight converter is 4 Kilos. Something tells me that aint right.
Whereas Springer and blitzwing are about 12 ounce = 340 grams.
Sigh. Why do they get so wrong??
Hmm, it appear Slystalker is coming up as 8.9 pounds as well. Not that he is available from Amazon anyway (But I bet he isn't 4 kg!!), but maybe there is some default weight thing that averages 8.9 pounds or something?
Same with BH Ratchet. They are all 8.9 pounds!