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Package: 1 * Potentiometer Knob Color: black Aluminum knobs are for sound equipments or rotary potentiometer, for protection and easy control. PU interior is useful to avoid damage and for long time service. Polish making, great decoration accessory for equipments. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.