http://www.dotan.com/rudder_25/

Stock & arm = 1kg = 2,25lbs
Rudder = 1,5kg = 3,375lbs
Total weight = 5kg per rudder set complete, just add crossbar.

Heavy ? yes, if you`re used to A-class numbers.
No, if you`re a Tigger sailor.

But then, they LOOK heavy , and looks are everything.