Such hologram stickers are used on telecommunication and mobile prepaid card. The consumers will find the black passwords after scratch off the hologram.
The transfer glue on the backside of hologram is black or grey, which can avoid the password exposed under strong sunlight lamp.
Silvery, golden, transparent, red, green, blue etc.
25 micron / 30 micron / 36 micron
Artwork files (made by CorelDraw or Illustrators ) or sample for reference are necessary.