Cmane07,
Be sure you have a BW that will take a fastflight of DynaFlight string.
"If your bow was made before 1988 (serial number 6782 or lower), you should NOT use FF or DF type strings."-from
www.Blackwidow.com/faq Generally speaking, faster strings have fewer strands and are composed materials with very little give (BCY makes many of these kinds)... but they are louder and more aggressive on the fingers and the limbs. BW come with DynaFlight stings. My BW has one and it shoots amazingly. You can buy a BW string on the site, which is what I recommend. Otherwise, check out 3 trees strings... they make great flemish strings!