75035 Sill Seal 3.5 in.X50 ft. Designed to fill the air gaps between the sill plate and the foundation wall, reducing air infiltration to provide savings on heating and air conditioning costs It's durable, moisture resistant characteristics prevent water and insect intrusion Made of high grade polyethylene Prevents rotting of the sill plate and will not deteriorate. Size Ins. x Ft.=3-1/2 x 50