This high quality engraved QR code sticker is made from durable material, with a 1mm thickness and strong 3M glue, perfect for flat surfaces. With a secure engraving, the sticker will offer long-lasting protection and guaranteed reliability. After placing the sticker please let the glue dry for atleast 24 hours.   Warning: This glue is extremely strong after placing this sticker it's almost impossible to remove. Use with caution.