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 . great decoration accessory for equipments.hese great looking knobs are high quality and precision machined from an aluminum alloy. The knobs have a knurled finish around their circumference. These knobs do not have a plastic insert; they are CNC machined from one piece of solid aluminum, with a durable anodized surface finish.

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