Blue Impulse Kizuna (Bond) Patch Received as a thank you for cooperating with the 731 Project. This is a valuable item that recreates the first flight after the Great East Japan Earthquake, and there don't seem to be many of them. I am selling a set of 5. I'm looking for someone who understands the meaning of the smoke and will cherish them. The proceeds will be donated to the 731 Project. 9.5 cm in diameter, with Velcro.