Suitable Length: There are four sizes of foam rod for you to choose, 1/8 inch x 10 feet,1/8 inch x 20 feet,1/8 inch x 50 feet,1/4 inch x 50 feet.Enough length can meet your daily needs.Foam rubber backer rod are easy to cut and install. Suitable for Most Cracks: Foam backer rod are suitable for most cracks, such as filling pavement and wall cracks, sealing doors and windows, as well as protecting dog ears and making ring frames. High Quality Material: This caulk backer rod is made of 2.0 rubber foam,which is different from the cheap foam,won't absorb water,safe to use,possess nice sealing effect.The foam backer is suitable for most kinds of cracks, such as pavement cracks, wall joints and foundations. Versatile to Use: You just need to cut the black foam rod into the length you need, put it in the gap to be filled, press it inside, and the operation is complete. Widely Used :The foam space filler can be applied for sealing household doors, windows, cabinets, shock absorption and noise reduction of industrial machinery and equipment, filling gaps in outdoor road surfaces, pet ear protection, and so on. This caulk backer rod is made of 2.0 rubber foam,which is different from the cheap foam,won't absorb water,safe to use,possess nice sealing effect.The foam backer is suitable for most kinds of cracks, such as pavement cracks, wall joints and foundations. The foam space filler can be applied for glass installations, expansion joints, door and window seam, and pavement joints, you can also use it to protect dog ears, make ring holders, complete craft projects and more