My cabinet knobs or pulls are solid ceramic. They are a 'standard' mushroom shape that is 1 and 1/2 inches in diameter. Each is hand drawn and hand painted with overglazes that resemble watercolors, then fired in my kiln.
They come with a 1 inch screw which fits most kitchen and bath cabinets but if you need another size they are readily available at hardware stores.
Custom cabinet knobs are available, just send me an email to begin the process.
Wildflower knobs - My wildflowers are (left to right) purple violet, bluet and pink lady slipper. I usually paint them on an amber background.