The 374 meter bow is somewhere around 90 pounds at maybe 22 inches. Not really sure about the exact numbers, but it's somewhere around that. The arrow was about 20 inches long, and it weighed about 10 grammes.
The bow that Marc built for me was fast, but perhaps not as fast as it looked. The most I have gotten out of it is about 270 meters with a 25 inch arrow. I'm sure it could do just over 300 with an optimal arrow and a good shot, but perhaps not much more.