We recommend that strings and cables be replaced at your local pro shop or the Ravin Service Department every 2 years or 400 shots. If you elect to replace the strings and cables, use only the Ravin Press. Do not use the Ravin Bow Press on any other crossbow. Carefully read before use, the instructions and its warnings supplied with the Ravin Bow Press. For use in the R26, R26X, and R5X only.