MVP Disc Sports Proton Vector Midrange Driver MVP VECTOR - The Vector is a slightly overstable midrange driver. STABLE-OVERSTABLE MIDRANGE - The Vector combines a classic stable-overstable midrange rim with GYRO Technology to provide long straight lines with a late and predictable fade. 13 MM CLASS - If there is too much wind for the Axis to get the job done, the Vector is a great choice. PROTON PLASTIC - MVPs most premium look and performance materieal. Designed to withstand the roughest conditions with a wide selection of transparent candy colors. PDGA APPROVED - For all professional disc golf play