They have a line of 7.4" diameter Carbon props for Q 40 Pylon, those are the only ones I have ever used. They are as far as I know, the only relatively low dollar bolt on and fly composite prop legal for RC pylon but I have been out of it more than 20 years, it may have changed. They are good props, safe well beyond the 25k or so the Jett and Nelson 40s turn. At a selling price of $8-$10 dollars each, quite a bargain considering you don't have to spend hours reworking them. They are not 100% carbon, still a mass produced carbon/nylon matrix. They have other carbon props listed but those are the only ones I have actually used.