Geospace FLY MAX Football with RPM Turbine Technology, Adjustable for Right- or Left-Handed Throwers The unique design provides maximum speed, accuracy and distance for each throw. Patented RPM Turbine Technology sets the FLY MAX apart from other practice footballs on the market. Super-aerodynamic shape with a hollow interior = less wind resistance & Max distance. Spin the RPM Max dial to set the adjustable fins for either left-handed or right-handed throwers. For "quarterbacks" Age 6 to adult.