In ordering a new string set you will need to have the following info on hand.
1. Make of bow. examples: Hoyt, Matthews, Pse, Elite etc.
2. Model of bow. Examples: (Pse) Brute, (Matthews) Chill x etc.
3. Year if possible. But not always necessary
4. You will need to know what string set style you have.
Single cam (1 string,1 buss cable)
Dual cam (1 string 2 buss cables)
Binary cam (1 string 2 control cables)
Hybrid cam (1 string 1 buss 1 control)
Also 5piece set (1 string, 2 yokes, 2 controls)
7 piece set(1 string, 4 yokes, 2 controls)
5. You will need to know, String length, Yoke length, Cable length, Buss length these are usually found on a limb sticker on the bottom limb close to the riser. In some cases your draw length will help in finding the lengths