Our Grey Weatherstripping, also known as Gaska, is made of polyethylene. It comes on 35 foot rolls and has one sided adhesive to seal screen doors to main frame. It is 1/4" x 1/2" x 35'. This weather stripping is used on our own All-Rite doors and has been used on Motorhomes and RV's such as Fleetwood, Winnebago, Forest River, Thor, Skyline, Monaco etc.