Significant price reduction: 1000 yen. Black rubber circular bands. O-rings, leftovers from a low-voltage electrical job 6 years ago. I think the rings are not damaged. If you think you can use them for something, please consider. There are 240 pieces. Size: Outer diameter 5.8mm, inner diameter 5.4mm. I measured them myself, so there may be some slight variations. 10 yen per piece. Thank you for looking.