【High Quality Material】3/4" backer rod is made of EPDM material, and has good toughness. Caulk rod is not only non absorbing water, durable, but also weather resistance. When you finish using it, you can achieve shock absorption and sound insulation effects. 【Flexibility Function】With good flexibility, you can freely bend and twist lightweight support rod into any shape you want. After soft caulk strip is deformed by external forces, space filler can be placed for a period of time to restore its own shape. 【Sufficient Size】Weather stripping rod has a diameter of 3/4" (20mm) and a length of 20' (6.1m). According to your daily usage needs and replacement needs, expansion joint filler will be cut to the appropriate size and used. With dirt resistance, you also reuse backer rod foam. 【Easy to Use】Black EPDM rubber caulk rod is easy to cut and install. Press soft strips into the crack space and make it fully fit. After completing easy installation, smooth the surface with caulking material to obtain a clean surface. 【Widely Used】Filler rope can be used for filling cracks in roads, walls, cement, lanes. Seal strip as well as can seal gaps in doors, windows, wardrobes, and closets. And caulk backing rod can also protect animal ears and make ring brackets. ToLanbbt Backer Rod EPDM Rubber 3/4" Diameter x 20' Length Caulk Saver Door Window Weather Stripping Seal for Concrete Filling Joints and Gaps (Black)