AFAIK, 531C or Competition is the way the started labelling the standard gauge stuff, 531P is the Special Lightweight gauge, while 531ST is the heavier gauge stuff.
Emanuel Lowi Montreal, Quebec
Be smarter than spam. See how smart SpamGuard is at giving junk email the boot with the All-new Yahoo! Mail. Click on Options in Mail and switch to New Mail today or register for free at http://mail.yahoo.ca