1.The package includes: 1 roll of 15 meters sound insulation sealing strip. The window seals are available in a variety of sizes to fit window seal gaps from 4mm to 10mm. Please measure the width of the gap before purchasing. 2.Material The window seal strip is made of durable and flexible silicone and can withstand extrusion in layers. The window sealing strip for frame can effectively prevent airflow, dust and noise from entering your home or office, providing you with a quiet and comfortable living space. 3.Design The window sealing strip adopts a special design. The construction effectively reduces sound transmission on both sides of the window and absorbs part of the sound waves, reducing the noise. In addition, it can effectively reduce the pressure force between the window and frame when closing the window, thus reducing the closing noise. 4.EASY INSTALLATION Our soundproof seal for windows was designed with convenience in mind and is incredibly easy to install. Measure, simply cut out the seal and install it in the desired place on your window.