FEBEST MZSI-MZ3R Upper Spring Mount 6 MONTH WARRANTY: All Febest Parts come with a 6 Year Warranty backed by great customer service. ONLY THE BEST STEEL: Febest only uses the best high-carbon steel. All Febest parts that contain metal use an expensive heat treatment process that improves metal strength and performance, also our parts use a higher level of polish to allow the bearing to roll smoother and last longer. ONLY THE BEST RUBBER: Each Individual component of this part is made with high quality materials. Unlike our competitors Febest uses only high quality Natural Rubber (75%) and (25%) synthetic Rubber. This means that it is more durable, will last longer, and can handle temperatures from -40 to +140 degrees. The Rubber wont rub off on your hand like the cheap replacement parts offered by competitors QUALITY IS EVERYTHING: The synthetic lubricant Febest uses is 10x as expensive as our competitors, and lasts 3x as long. GERMAN QUALITY CONTROL: Febests German quality control experts ensure that all parts are of the utmost quality. We have specially developed metals and rubbers that create a super durable, and long lasting end product.