Manufactured from the finest materials available. The 412s simple, durable design makes them a cost effective improvement to your motorcycles suspension performance. A five position cam style spring load preload adjuster lets you easily dial in your ride. Available with either a standard or heavy duty progressive spring rates. Sold in pairs. Made in the USa. Many fitments are available in either Standard or Heavy Duty. HD applications are recommended for bikes that are operated at or near the manufacturers maximum load rating over 50% of the time. Before purchasing or attempting to install shocks that are different than the OEM length, confirm that your wheel travel can be altered without causing clearance issues such as swingarm/axle to exhaust contact as well as chain/belt guard or tire contact.