Matt 'Mayhem' Biolos deserves his own fin set at FCS. This special Carbon 5 fin set allows you to completely customize your own design. If you choose a truster setup, you get more control in the hollow waves, but if you want more speed and flow for carving go for the quad setup. This means that this fin set makes your board twice as versatile. The FCS II Matt Biolos PC Carbon Tri-Quad fins are equipped with the FCS II system and it's super lightweight.