For Guitarists And Guitar Enthusiasts, Joyo Offers The Infinite Sustainer JOYO infinite sustainer electronic effect bow provide two different sustain effects. It's made of polyamide, quite durable, with ergonomic design, streamlined contour and comfortable handling. We can switch to normal effect or overtone effect swiftly by turning the switch upwards or downwards during performance. JOYO user-friendly infinite sustainer is specially designed for guitarists devotee, bringing out natural and pleasant sustainer effects. It enables our electric guitar to offer legato,overtone, long sustain, vibrato and more from stringed instruments played with a bow by the magnetic field effect.