3M Windo-Weld Round Ribbon Sealer is designed as one roll of sealer with setting blocks. This ribbon sealer is constructed with a unique feature of controlled compressability which allows for easy installation. This product will not squeeze out or allow light to contact pinchweld. This roll of sealer comes with a sufficient amount of material to replace one windshield or backlite.Compress with Control for Easy Install We designed 3M Windo-Weld Round Ribbon Sealer as one roll of sealer with setting blocks. This ribbon sealer comes with the feature of controlled compressibility. This feature allows for easy installation and will not squeeze out or allow light to contact pinchweld. As a 15-foot roll, this product has a sufficient amount of material to replace one windshield or backlight. >For reference: 3M Windo-Weld Round Ribbon Sealer is a bulk-packed version of 3M Windo-Weld Round Ribbon Sealer. Exceptional One-Roll Ribbon Sealer For controlled compressability and easy installation, utilize the features of 3M Windo-Weld Round Ribbon Sealer, a one-roll sealer that offers sufficient material for a backlite or windshield replacement. Easy to use, enjoy the advantages of our ribbon sealer, a product that offers optimal results and performance longevity.