Maybe its just me, but the white one feels less easy to squeeze, and a small bit heavier than the rest of them?
No idea about the weight, but maybe your flat is quite warm? the white one will reflect more heat, so will be less supple than the other colours, Harvey has suggested this might make it a good summer ball.
No idea about the weight, but maybe your flat is quite warm? the white one will reflect more heat, so will be less supple than the other colours, Harvey has suggested this might make it a good summer ball.