One 12" x 12" sheet of Oracal 651 Applications:  Medium-term indoor and outdoor lettering, marking and decorationThickness:  2.5 milDurability:  Up to 6 yearsRelease Liner:  84# custom silicone coated paper with special release characteristics that provide excellent weeding and release values. Customized blue silicone paper liner for matte and gloss white provides superior contrast for weedingAdhesive:  Clear, solvent-based, permanent adhesive