Quality Material: this caulk backer rod is made of quality foam, which is round, closed cell, low density, safe to use, possessing nice flexibility and can be bendable, won't absorb water, you can use it for filling spaces or joints Long Enough: you will receive 1 piece foam backer rod approx. 100 feet long, which can be easily trimmed to the right size with scissors according to your actual needs, sufficient length can meet your daily needs and replacement Effortless to Assemble: the backing rod is soft and flexible, just get the desired part and put it into the space, and press to make it well fit before applying sealant, simple and effortless to assemble Widely Applicable: filler rope is suitable for most kinds of cracks, such as pavement cracks, wall joints and foundations, which can provide a neat surface for caulking projects; Classic gray color can be matched with various styles Versatile to Use: the gray 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