TenPoint Crossbows Replacement String for Vapor (HCA-11813) Fits Vapor 37.125-inches long, RED/BLACK COLOR Proper maintenance of your crossbow ensures that it continues to operate reliably, and replacing your worn out string is essential to upkeep Constructed from the OPTIMUM COMBINATION OF MATERIAL to give you the performance you demand Comes PRE-TWISTED FOR EASY INSTALLATION and out-of-the-package performance