3M™ Windo-Weld™ round ribbon sealer is designed as one roll of sealer with setting blocks. We constructed this ribbon sealer with a unique feature of controlled compressibility which allows for easy installation. This product will not squeeze out or allow light to contact pinch weld. This roll of sealer comes with a sufficient amount of material to replace one windshield or backlite. 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 pinch weld. As a 15 ft 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. For controlled compressibility 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. 3M™ 7100020861, Replacement, Black