Reuseable clear mylar film - 1" x 8" x 0.008" (8 MIL) Thick, rigid, strips wlay flat against the glass - Will not block the UV Ultraviolet light needed to cure adhesive resin An intregal part of the professional windshield repair process - Perfect for long cracks or longer windshield glass breaks Windshield repair resins are anaerobic adhesives, they require the absence of oxygen to cure fully A repair that is not covered completely during the curing process can fail as air may enter the break or the resin may run out Curing strips are a thick, rigid mylar material cut to a longer length, a good choice if you are managing multiple locations or technicians and inventory control is a concern. Being thicker and more rigid, strips will lay flat against the glass for an air tight seal during the curing process. Use 356 nm Ultraviolet light to cure adhesive resin in windshield crack, rock chip, bulls-eye, star or combo break.