I'm sorry, this A band won't, but this I band will also decrease in size, as well as the h zone will decrease in size. But the A band, which actually includes the entire length of that thick filament will not change because the length of our thick filament does not actually change when our contraction takes place. So notice that when our muscle contracts, the A band does not change because the thick filament does not change its length, its size. However, both the h zone and the eye band do change. In the case of our eyeband, it decreases, but in the case of our h band, it disappears entirely because the h zone is based, not the h band, the h zone. The h zone contains only our thick filament.