The Rays weight 23.3 grammes per M12 X 1.25 thread pitch lug nut. The 1.5 pitch lug nut is slightly lighter at 22.6 grammes. Option Magazine February 2007 issue actually has the weight of most popular performance and aftermarket lugnuts listed. The stock lugnuts easilly weight 2.5-3 times more. Pix from slightly farther away
I also have some Rays lightweight aluminium wheel valves on order. Should be arriving after CNY hols.