Compatibility with Standard,16 groove, coarse (18 tooth spline) shafts on Bourne pots, AM93, EG112C2, Cherry SE , , , RG series guitar. The top half of the knob is transparent, middle is gold and the bottom is black with white numbers, color to mix and match with or replacement of parts, these black and gold knobs added a look to it and really makes it popularity. Material: Made of high-quality acrylic plastic material with great endurance, durable to use, the knobs are well-made, and symmetrical, and the numbers are clear. Easy to install: Just need to slightly spread the post with a flat head screwdriver and they seated level (as level as possible on an archtop) and to the body. It is a perfect substitute for electric guitar knobs. "caution" tight on pots, carefully squeeze split shafts, do not force on. Height: 12.1 mm/0.48 in; Top diameter: 23.1 mm/0.91 in; Base diameter: 25.2 mm/1 in; Inner diameter: 6.0 mm/0.24 in. Colour: black + metal Material: acrylic Package Contents: 4 * Button caps Only the above package content, other products are not included. Note: Light 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 +/- 1-3cm.