Christian they do a range of horns too in the double range with a ball link pre-fitted (you can change them over)......
http://www.gabriel-stahlformenbau.de...l?dataoffset=0
I have used them on my Orion, found them superb, easy to fit, strong and well designed. The process is as I understand a carbon reinforced plastic which is pressure and heat set to give a very strong product. The horns are easy to mount as they have pins so a hole is required which is easier to do than a neat slot IMO.
Here's my Orion......
Build thread link, see #34 for horn and linkage pics detail...
http://www.rcuniverse.com/forum/rc-j...-thread-2.html
marcs