Sorry about my absence, but I’ve now had time to do some more research on the Gefa system. (I left for my sisters wedding 5 min after I posted my first post, so I didn’t really have time to read all the stuff inn the catalogue.)
From reading in my paper catalog the GEFA system is a system with dynamic ropes (not dyneema as this is a full static rope/webbing). This means you don’t have to add a dynamic component (like the rubber “dilldo” in the Cobra system) to the system. Just secure the ropes to the belts.
The GEFA comes inn two different dynamic makes, one that stretches up to 5% and one that stretches up to 20%. The ropes are made to hold loads of 2, 4, 7 or 10 tons. There is an indicationthread woven inn that breaks if the rope is loaded more than 80% of its estimated loadcapacity.
There is also one rope that is made of dyneema, but this one is static. It holds 14 tons, but stretches only 2%.
As for the “skogma.se” page, if you write “gefa” in the slot up to the right, you’ll get up belts, ropes and all the other stuff.