Brownell FastFlight Plus 1203589. Fast Flight Plus bow string material should add approximately 5-7 fps to your arrow speed. Fast Flight Plus features a diameter of .014". Specifications for Brownell FastFlight Plus 1203589: Manufacturer: Brownell Color: Neon Green Additional Features: 1/4 lb. Weight: 0.25 lb Features of Brownell FastFlight Plus: Flo green. Minimal stretch. Adds approximately 5-7 fps to your arrow speed. Diameter of .014". Package Contents: Brownell FastFlight Plus