Our Black Weatherstripping, also known as Gaska, is made of Vinyl. It comes on 75 foot rolls and has double sided glazing tape to seal glass to plastic radius frames. It is 1/8" x 1/4" x 75'. This weather stripping is used on our own All-Rite Windows and has been used on Motorhomes and RV's such as Fleetwood, Winnebago, Forest River, Thor, Skyline, Monaco etc.