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The Xtreme FS310 is a durable Sustain / Damper pedal that suits all digital pianos and keyboards that have a standard 6.35mm (1/4") jack. A convenient polarity switch can accommodate Normally Open (NO) as well as Normally Closed (NC) configurations regardless of brand. Study metal pedal Momentary (non-latching) action. Tough ABS casing Mono jack Polarity switch to suit all keyboards and digital pianos