Item Description: Maretial: Synthetic Butyl Rubber Color: Balck Item Length: Approx. 4m 13ft. (Enough for Re-sealing about two - four headlight assemblies.) Item Thickness: Approx. 9mm 0.35'' Rubber Sealant is a black, non-drying, non-hardening synthetic rubber based butyl rubber sealant suitable for use as a placement sealant tape for re-sealing headlights after a retrofit or for installation between the glass and metal/llastic areas of automotive headlights/windscreen. Features: .