Purchased over 10 years ago (location of purchase unknown). Size is approximately 6.5 cm. One of the back pins is missing, so a clear back pin will be included. Used 4-5 times at the time, then stored in an accessory case. I plan to wipe it down and disinfect it before packing. Please understand that this is a used item and has been stored for a long time by a non-professional. Use is at your own risk. Thank you for your understanding.