I believe that AIR changes the spoiler rope on the gliders that come through their shop every two years. I decided to change mine after three years and about 160 hours of flying. The spoiler rope is attached to the end of the cable that runs from the control frame. It is not just perlon, but a special non stretching material. I would guess some type of outer material with a spectra core. If you change this rope, make sure the product you use will not stretch under load or you will not get full spoiler deflection. The rope used is 3mm in diameter.