For in the studio and on the stage to pick up box and other piano strings C411 is a suitable guitar, mandolin, high performance micro capacitance pickup violins and other stringed instruments. Its built-in capacitance pickup head can reproduce the sound of the instrument without staining. C411 super light weight (18 g) seamless Velcro attached to the keyboard or the back of the bridge so easily through the included, without affecting the balance of musical instruments.