For the "eyes" beneath the cockpit.
Larger images:
September release, 5,040 Yen (inclusive of tax).
New images for two other upcoming Gundam merchandises:
HG 1/144 Reborns Gundam
September release, 1,890 Yen (inclusive of tax).
SHCM-Pro Gundam Unicorn
October release, 10,290 Yen (inclusive of tax).
All images from Ganguya: MG Guntank, HG 1/144 Reborns Gundam, SHCM-Pro Gundam Unicorn.