The Aurora film is a sheet of holo/reflective sticker that you can use to detail your Gunpla's visors, gun scopes, or weapons!
To make sure that you got the size right when applying the sticker, you can go over the area that you want to cover with masking tape first, then trace over it.
Afterwards, cut the masking tape to size, and place it on top of the sticker sheet.
Use a sharp modelling knife to cut the sticker to size, and you're set! Apply to the area you want with tweezers!
Made in China.
