Natural shell buttons, approximately 19mm across and ranging from about 0.75mm to 2mm thick. These do have a pearly iridescence to them - they are not a "flat" colour. They are irregular and some have a wavy shape which reminds me of a certain potato chip. XD Feel free to indicate above if you have a preference for the waviness of your buttons.
I take care to pick the best available buttons for each order but, since shell is a natural material, there may be slight imperfections and variations in colour. Please wash with care - avoid using acidic cleaners and tumble-drying.