These Cannondale R500 CAAD 5 were produced back in 2004. It's an aluminium 6061 T6 frame. This one came with 54cm framesize. The 'SI Slice Ultra' carbon fork has an aluminum steer tube and fork ends.
I'm quite not sure about the color... To me the color looks like 'PatriotBlue (Mate)', rather...
Cannondale CAAD 3 R400
These frames were build originally with Cannondale Coda brakes/stem/crankset, Cinelli Bar, Mavic CPX wheelset and 3x9 Shimano Tiagra 4400 groupset in year 2002.
The color is called 'Midnight Blue' and it is a darkish blue as main color with some brighter blue metalic...