For some reason I am thinking WC strings and cabels. I think I am wrong, they told me and I forgot[&:] It's not on their site.
The draw on the GTO is "harder" than both my Ross bows, but it's consistant. I have fond many speed bows havea clunk or a "bump" in the draw cycle somewhere.

I should point out I like a consistant draw of the GTO and for a speed bow she's damn smooth IMO