Frost King Gray Poly Foam Caulk Saver For Gaps and Openings 20 ft. L X 0.5 in.

1/2" x 20', Caulk Saver, Reduces The Amount Of Caulk Needed To Fill Large Gaps, Works With Virtually Every Type Of Caulk & Sealant, Made Of Durable, Resilient, Moisture Repellant Poly Foam, Just Press In Place, Then Caulk On Top Of It.