Frost King F4 Mortite Caulking Cord 9.5-ounce, 45-Foot Long, Grey by Frost King Go to amazon.com Related posts 14 best mortite caulking cord for 2022 FeatureFrost King F4 Mortite Caulking Cord 9.5-ounce, 45-Foot Long, Grey45'Grey DescriptionSeals in cool air;Presses into place with fingertips;Shuts out hot air, dust, dirt and insects;It is paintable;Easy to install