Suitable length: you will receive 1 piece foam backer rod 3/8 Inch x 200 feet, sufficient length can meet your daily needs. Backer rod are easy to use and install. Quality Material: this caulk backer rod is made of quality foam, which is round, won't absorb water, safe to use, possessing nice sealing effect. Possessing nice flexibility and can be bendable, Works with virtually all cracks and spaces. Note: the backing rod is soft and flexible, After a product is packed and squeezed, it can recover by itself after being unpacked and left to rest for a while. Use and install: you can use it for filling space.