O ring is a so-called packing, so it plays a role of filling the gap between the baffle and the unit basket. If there is a gap in this part, the amplitude of the front and rear of the unit diffracts, and the sounds cancel each other out. It is a necessary part to sound sound correctly. ・Most packages are sent small package with tracking number via Japan post. Most packages arrive within 2 weeks but it can take longer due to getting caught up at customs etc. If you haven't received your package after 5 weeks (sadly it has taken that long for some countries), please contact us and we can discuss what to do next. ・International Buyers : Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility. These charges are norm.
eBay