ORIGINAL: davepjr71
The kit comes with most of what you need. Even if you buy the kit I'dbuy either BCY #62 or Brownell Diamondback Center serving. The poly that comes with the kit issoft and comes apart easily and isn't really recommended for the strings on today's bows from what I've read.
Josh did his with BCY #62 .025
I used the Brownell diamondback .026 for comparison reasons.
It has worked fine for me.