Most bow strings do stretch and some never stop stretching. There are a couple of quality manufactures that make a pre-stretched strings, Winner's Choice is one. It sort of hurts the pocket book but money well spent. I have bought several strings from WC made with the 8125 material and am very pleased with them. The servings at the center and at the cams do not seperate. The peep once adjusted will stay and will not need adjusting for 1000"s of shots. Just make sure you order the correct length strings and control strings. Measuring the old strings most likly will be longer than when they were new. Strings can stretch as much as 2" look at the lable on the bow or contact the manufacture to find out the correct lengths required.