2 linear rails " 18.25 long with 2 bearing blocks each Check out http://www.us.nsk.com/public/enu/351_912.asp for more information on the bearings (NSK LS20 S) they are in very good shape no rust or other blemishes they are like new I listed them as used because
I did not know if they were new or used look new to me
biding starts at $50.00 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=220482464241&ssPageName=STRK: