This product has a good mute effect, easy installation and high security.The high-quality sound insulation board effectively reduces the reflection interference of the indoor sound waves, maintains the optimization and improvement of the sound purity, and makes the sound clear;-------------------------------------------------- -------------Product Name: Piano Room Sound-absorbing Cottoncolor: greySize: 50*50*8CMQuantity: 10Area: 2.5 square meters♥ Acoustic Panels: Designed for good acoustic properties, it reduces noise and eliminates echo, making it ideal for home studios;♥ Acoustic Panels: high-quality materials, home acoustic panels, maintaining their sound insulation for effective sound control;♥ Acoustic Panels: Use professional acoustic control to reduce the waves, reverberations and tremors in small and medium-sized rooms;♥ Acoustic Panels: Tip: This product is not sticky. After the customer receives the package, he needs to purchase the glue to install it. The installation is simple and convenient;-------------------------------------------------- -------------1. Tip: Due to different measurement methods, slight errors may occur. Please refer to the actual product;2. Tip: As we use international logistics, parcels usually need to arrive within 14 to 25 days.Your like is my biggest motivation, and I look forward to your purchase and browsing. If you have any questions about the product, please write to us and have a nice day!