Easy to work with. Properly reseal any headlamp or some tail lamp and protect against moisture ingress with Butyl Headlight Sealant! This new and improved sealant rope was designed specifically for headlamps. This makes it easy to work with, without causing a sticky mess. Each roll comes with about 20 feet in length & about 7mm diameter which can also be easily scratched to fit inside your headlamp channels and it normally more then enough to reseal pair of headlights.