cranckpulley

i have made with CNC a lightweight cranckpulley A2..what do you think?? The oem honda is 1.7 Kg weight, and this are 0.4 Kg of weight! I read in many post a lot of people don't want to change it with the alloy pulley http://img220.imageshack.us/img220/4021/25042010108.jpg...