Thank you for viewing from among many items! Diameter: Approximately 1.5 cm I have been storing this at home, intending to use it someday. Thank you for your understanding, and I appreciate your consideration and purchase. I am also listing several other buttons. If you would like to purchase them together with other buttons I have listed, I will discount the total amount by 150 yen for each additional item. Please let me know your wishes in the comments (^^). Please note that if someone purchases an item before we finish our comment exchange, I will prioritize that purchase. Thank you for your understanding.