Sweetwater Sales Engineers have the gear knowledge and the real-world experience to answer your questions about the Martin MSP7200 SP Lifespan 92/8 Phosphor Bronze Strings (.013-.056 Medium 2-Pack). We'll be happy to take all the time you need to help you decide whether this is the right product for you. Submit your questions below and we'll get right back to you. Name, Email and Questions/Comments are required.