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Just stick it on to prevent crime. If you stick it near a key such as a sash, it will crack even if the glass is breaked, but it will not break the glass. [What you need] Cellophane tape, mist spray, mild detergent, paper towel, spatula; [Size] Approx. 15.7 x 9.8 inches (40 x 25 cm) (thickness approx. 188 microns) Country of Origin: Made in Korea