This is a set of 10. If you need 11 or more, please contact us, and we will add them for 40 yen each. These are buttons for rugby jerseys. They are made of materials and specifications that prevent injury in the intense sport of rugby. The diameter of the button is approximately 14mm. They are harder than Canterbury rubber buttons. (Please refer to the third photo for the size) These buttons are made of TPE material, which is resistant to cracking even when impacted. They are ideal for sportswear such as rugby shirts.