Replacement gasket for airtight stoves, fireplace inserts and coal or pellet stoves. Designed to securely seal stove window glass in stove doors and openings. Prevents air leaks and improves efficiency. Withstands temperatures up to 1000�F (538�C).Specifications. Color - White. Fiberglass tape. Size - 0.75 in.x 50 ft.. Item weight - 8.5 lbs.Features. Replacement gasket for airtight stoves, fireplace inserts and coal or pellet stoves.. Designed to securely seal stove window glass in stove doors and openings.. Prevents air leaks and improves efficiency.. Withstands temperatures up to 1000�F (538�C).. Color - White. Fiberglass tape. Size - 0.75 in.x 50 ft.. Item weight - 8.5 lbs.