Extension springs are color-coded per rigidity, or energy, degree. http://asio.basnet.byyf0dby0l56Lls-9rw.3pco.ourwebpicvip.comN.3@www.theleagueonline.org/php.php?a%5B%5D=%3Ca+href%3Dhttps%3A%2F%2Fbookmarks4seo.com%2Fstory18044902%2Fgarage-door-repairs-and-set-up-entry-storage-doorways-of-tallahassee-fl%3Egarage+door+repair%3C%copyright%3E%3Cmeta+http-equiv%3Drefresh+content%3D0%3Burl%3Dhttps%3A%2F%2Ftoprankdesign.co.uk%2Fwiki%2Findex.php%3Ftitle%3DStorage_Door_Repair_Set_Up+%2F%3E