Ply Gem 0.75 in. x 1-1/2 in. x 12.6 ft. White Vinyl Finish Trim

Cellwood Vinyl Finish Trim, also known as Undersill Trim, is used to hold the top row of siding in place, near the roof line or under windows. It is a necessary accessory for any siding job. Cellwood accessories are designed to withstand the toughest weather and retain their beauty and color, year after year.