The round button comes in five sizes: 1.25 inch (approximately 3.2 cm), 2.25 inch (5.7 cm), 3 inch (7.6 cm), 4 inch (10.1 cm) and 6 inch (15.2 cm). You can also change it to more... a square button, which is 2 inches (5.1 cm) across.
These high quality buttons are made of 100% recycled paper. The vibrant colors are covered with scratch- and UV-resistant Mylar. It has a durable metal pin-back that makes it easy to pin it up anywhere.