Both alu frames. The Bianchi is a bit of a mish-mash of parts (Ultegra chainset; Veloce brakes and front changer; 105 gear leavers), but it works just fine.
Incidentally, I prefer the ride of the Mavic Open Pro's over the "much" more expensive SL's. Don't even notice the slight weight penalty, but then I'm no Bradly.