Normally I don't chime in much on these forums,unless that is it's a topic I am intimately familiar with.Well this just so happens to be one I know.
Some time ago at the urging, I'll say of Doug Deacon (hi Doug)
I tried the holographic mylar- mine isn't actually holgraphic it is 1.5 mil thick if not 2 mil. Being a Raven owner I presume you're aware of our plight,unlike Galibier,Teres owners the capstan is 3/8" as opposed to 1/2" so I had to do some hunting as it were to find a compatible mylar replacement.
With a little direction from Doug,I was able to experiment with this mylar substitute.I didn't believe I'd readily be able to tell if it was an improvement or detriment.
To make a long story short,while some find it "better" if not great I believe Ducatirider,as well as one other Raven owner his name escapes me righ now.I wasn't so convinced.Private mail me if you'd like the whole story,also I have plenty of mylar,and splicing tape if you'd like to experiment.
From my experience the supplied belt is the BEST option.
If I might ask what is it you don't like about the current belt?
Jeff