Lorell LLR02156 36" x 48" Standard Chair Mat, 19" x 10" Lip, Clear Chairmat Offers Intermediate-Weight Vinyl Construction, Ramped Edge And Gripper Back Use On Low-Pile Carpeting Crystal-Clear Chairmat Offers A Studded Back To Grip The Carpet Firmly And Beveled Edge For Smooth Chair Movement Limited Lifetime Warranty Made In The Usa