Technical information for strings-cables-servings
The recommended number of strands takes into consideration the size of the string and the size of the serving. Another consideration, which affects diameter, is whether or not you leave a pigtail under the serving. For a slightly larger diameter serving you would leave a pigtail. If you prefer a smaller diameter then you would start your serving, go about an inch, then cut the pigtail end off and continue your serving. Brownell’s recommendation for center serving is calculated for a nock fit of about 100 thousands which is the average nock size. You would need a thinner diameter serving for nocks normally used on target arrows.

Our most common serving recommendation is the .026 for the center serving for a snug fit and a .022 for a looser fit.

For smaller cam groves or instances where there is a close tolerance between the cam and the limb you would want to use the mini serving. It has a diameter of just .015 and works great for certain applications.

For most end servings the 1-D is the preferred serving material.
Many new traditional type bows today are using the high modulus polyethylene string materials but you want to make sure to check with the bow manufacturer before using anything other than B-50 for this type of bow. If your bow is set up to use the high modulus polyethylene materials the D-75 regular is a popular choice.

Brownell’s Ultra-Cam is tried and true. If you will use this material for your cables your days of worrying about your marks moving or your bow tune changing are over. You can also use the Ultra-Cam for your string, as do many of the top pro’s. However, if you have the issue of “a need for speed” then you might want to use Fast Flight Plus for your string that would then give you a little more speed. If you are going to be shooting in extreme hot weather the Ultra-Cam material can’t be topped. Our new Astro Flight is also a stable material and can be used on strings and cables.

Some companies pre-stretch strings before they put them on bows. This practice is becoming very popular and helps to eliminate the break in period for bowstring material. Brownell recommends three hundred pounds as a sufficient weight for pre-stretching a bowstring. Most string creep is due to the strands seating into the wax that aligns the strands together in the string bundle. Pre-stretching will speed up this process.

Bowstring materials recommended number of strands

Brownell recommends 1 twist in the string for each 2-3 inches of string length

Astro Flight
Ultra Cam
Fast Flight Plus