They are made of high-quality materials and have been designed to provide an impeccable sound quality. The crossovers offer an unparalleled sound experience, making your music come alive. The Infinity Reference Studio Monitor Crossovers are superbly crafted and provide a long-lasting, high-performance solution that will meet all your audio needs. Due to the age of these I'm selling as is no returns and no refunds. They are missing the fuse and holder other then that they worked before.