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, nice color to mix and match with or replacement of parts, these black and gold knobs added a nice nostalgic look to it and really makes it popularity. Material: Made of high-quality acrylic plastic material with great endurance, to use, the knobs are well-made, smooth 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 close to the body. It is a substitute for electric guitar knobs. "caution" very 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: 20 x Button caps Only the above package content, other products are not included. Note: Light reflection 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.