Polaris 1000 S / 900 S (DRS) Dual Rate Spring Kit By Shock TherapyFree Shipping in the Lower 48 States PRODUCT DESCRIPTION Polaris 1000S 900 S (DRS) Dual Rate Spring Kit Get rid of the collapsed upper spring and ride in comfort with you the Shock Therapy Dual Rate Spring Kit! Reap the benefits a Shock Therapy dual rate spring kit can bring to your machine, it will reduce washboard chatters, bucking through whoops, increase bottom out resistance and ride height with this kit. . These spring kits are custom tailored