According to FedEx shipping, the fronts are 23lbs. and rears 26lbs. I'm not sure if they're aluminium or not. They're made in Italy, which I feel more comfortable with opposed to China or Korea, etc.
Speed rating on the TireRack website said "YR" but the tires say "ZR" like in the following (awesome) picture:
http://www.tirerack.com/images/tires/bfg/bfg_gforce_ta_kdw2_1000.jpg