I was collecting buttons, but I'm selling them now since I no longer use them. The large buttons are approximately 2.5 centimeters in diameter, and the button shank is about 4 millimeters. The small buttons are approximately 1.8 centimeters in diameter, and the button shank is about 3 millimeters. The buttons are very light; the large ones weigh 1 gram, and the small ones are for cuffs, so there are two of them, also weighing 1 gram.