The RoadPro RP-311HD 3" Chrome Plated Steel Heavy Duty CB Radio Antenna Shock Spring is a durable and reliable accessory designed for mobile/vehicle antennas. Made of high-quality steel, this spring is universal and compatible with various brands and models. It provides shock absorption to protect your antenna from damage during travel or rough terrain, ensuring optimal performance for your radio communication needs. Additionally, it comes with a California Prop 65 Warning, informing you about potential chemical exposure.