JD.Moon 4pcs Brass Dome Knob Volume Tone Control Knobs for Electric Guitar Bass Screw Type (Gold) All metal material without plastics inside. Works for Pots of 6mm in diameter. Durable gilded metal material. 4pcs dome knobs with coarse knurl on the sides. Satisfaction Guaranteed:Fulfilled by amazon,if not satisfied with the item,you can return it without hassle.