D97 ofers the best balance of speed, silence and stability in any high performance string material we've ever tested. This high-strength, low-stretch Dyneema string material shoots hard and fast with little, if any, after the shot vibration. If you're looking for a high performance string to get all your bow has to give, choose D97. Note: A 1/4# spool of D97 gives you approximately 1700 feet of material. That's over 50% more material than B50 or B500! Be sure your bow can handle high performance strings before using D97 or Fast flight strings. Available in: Black, White, Red, Green, OD Green, Blue, Yellow, Tan and Brown. Two sizes available: 1/4 Lb and 1/8 lb. Please specify size and color.