SIZE: Backer rod diameter 1/4'', length of about 100', slightly flexible can become thinner, can also be cut according to the needs of the use of arbitrary cuts. Diameter error of about +-0.3mm. QUALITY MATERIALS: The rubber backer rod is made of high quality EPDM. It is denser and more flexible and durable than ordinary closed cell foam backer rods EASY TO USE: Foam caulk is simply cut with scissors to the desired length and pressed evenly into the gap to be filled, covering it with caulk as required. CHARACTERIZATION: Caulk backer rods are resistant to high and low temperatures and weatherproof, high density and waterproof, so they won't hold water and are more windproof. WIDE RANGE OF USES: The space filler can be used to fill all kinds of cracks in pavements, walls, etc., as well as sealing seams in sliding doors, glass doors, windows, cabinets, etc., and can be used for protecting dog ears, making ring holders, and craft projects!

The rubber backer rod is made of high quality EPDM. It is denser and more flexible and durable than ordinary closed cell foam backer rods

Foam caulk is simply cut with scissors to the desired length and pressed evenly into the gap to be filled, covering it with caulk as required.

Caulk backer rods are resistant to high and low temperatures and weatherproof, high density and waterproof, so they won't hold water and are more windproof.

The space filler can be used to fill all kinds of cracks in pavements, walls, etc., as well as sealing seams in sliding doors, glass doors, windows, cabinets, etc., and can be used for protecting dog ears, making ring holders, and craft projects!