Touge Techniques Team race-proven performance couplers, Custom designed in house with our signature Touge Forest Green - High-temperature, high-boost application crafted for full-race use - Constructed with durable 4-ply, high-grade silicone - Superior temperature resistance rated for -60 degrees F to 375 degrees Fahrenheit - Touge Techniques couplers are tested to prevent tearing or shearing under extreme use.