Most HC's that are Copper/Brass look like the ones you linked. The AL ones look wierd ( hahah bad word), or in other words they look different than these types.
A definite way to see if it is copper, is to get past the oxidation and inspect the metal. Scratch the surface and it should look yelloy/orange.
Brian
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Water Cooled Inwin Q500 (Dual Rads: Rad1 = DTEK Pro Core | Rad2 = Blick Ice Estreme, Hydor L30, Dangerden Maze2, Bay Res Typhoon Reservoir, 1/2 " DD Tygon Thick Wall Hose).
Flow: Res, Pump, CPU watervlock, Y into both rads, both rads into res independently.
Athlon XP 1800+ (@ 1731 - 150mhz fsb.), on a Asus A7N266-c, and a Radeon 9000 *waiting for RMA'd Saphire 9800 ultra from Newegg)
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