4pcs Guitar Volume Tone Knob Acrylic Guitar Speed Control Knob for LP SG Electric Guitar Specification: Material: high-grade acrylic Color: Black+Gold, Clear+Black, White+Black, White+Gold, Red+Black (Optional) Small diameter: 17mm/0.67" Large diameter: 26mm/1.02" Potentiometer installation inner aperture: 6mm/0.236" Note: 1. There may be slight size deviations due to manual measurement, different measuring methods and tools. 2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor. Included: 4 X Guitar Knobs