No problem--I love to talk about strings.
"FF Compatible"
"FF" stands for "Fast Flight", which was the first modern high performance bowstring material. It's now used generically in reference to any of the high performance bowstring materials.
It was invented for Brownell by Bob Deston when he worked for them. Bob is the co-founder of BCY and has continued to be on the forefront of modern bowstring materials. He's the one to thank for every advancement made in bowstring materials, including BCY-X, which is the latest and greatest advancement. Not only did Bob invent the first modern high performance bowstring material, he also invented the first combined material--450 Premium.
"B-55"
B-55 is the name of BCY's polyester bowstring material. It's safe for any bow. With the modern materials, the bow has to be built to use them else they could damage it due to their very low amount of elasticity. It's commonly referred to as "Dacron".
"Endless/Flemish"
These are the two basic ways of assembling a bowstring.
Endless is generally 1-3 strands of material (depending on how many colors you want in it) wrapped round and round on a jig, with the loops being formed by separating and serving them.
Flemish is individual strands in 2 or 3 equal bundles with the ends twisted back into the main body of the string to form the loops--similar to a rope. These are the ones that generally have the "barber pole" look, and no serving at the loops.
Lots of technical information on string and serving materials at
www.bcyfibers.com . I have a FAQ section on my site that might help. If you have questions, feel free to post them, pm, e-mail, or call.
Chad