Yamaha SLG200S Steel String Silent Guitar, Natural Steel Strings, Natural Finish The SLG is the perfect instrument for practice, travel or stage use  any time an acoustic guitar just wont do. Near-silent performance makes discrete practice simple Yamahas exclusive SRT-Powered pickup system gives incredibly natural acoustic tone through headphones or line-out Studio-quality on-board effects enhance your playing to perfectio and line-in functionality makes jamming easy