Extra Long Weather Stripping- Total length is 40 feet, it's long enough to use for different size doors. Our kerf weather stripping spine is 5/32 inch ,it suitable for the 1/8 inch groove and used for door gaps from 1/4 inch to 3/8 inch NOTE:Please measure groove size before purchasing. PVC Flange Design-Our kerf door seal is designed with rigid PVC flange,it is very easy to applied to the door frame with grooves and without worrying about falling off. Tear resistant PE cover and high resilience PU foam make this door weather stripping durable and flexible,continuous rebound as time goes by and conform well to door frame and remain pliable in low or high temperature. Easy to Install-The weather stripping is no adhesive needed, direct installation, after measuring the length of the gap that needs to be sealed, cut the weatherstrip to the desired length, just insert the white plastic flange into a slot or a groove to finish a tight seal, not easy to fall off. Multi-function - This is perfect for replace the old worn out weather stripping and very useful for lockout noise,light, rain, dirt, wind, leaves, snow, smell and no creepy crawlies sneaking in . It is a great way to keep the house warm in winter and cool in summer and help you reduce the electric cost . Enjoy the peace and quiet of your home No Risk Purchase- All our products are covered with our FAST free replacement or FULL refund If your have any questions or feel unsatisfied in any way, feel free to let us know and we will reach you at the soonest.