produced sample Formed by combining rubber sheets and sponges, the total number exceeds 500.
There are also officials Participants in Butterfly R&D include Zhang jike, Mizutani Jun, Timo Boll and Chuang Chih-Yuan.
They have conducted experiments. Hundreds of hours have been spent experimenting.
Numerous tire samples were retained because they failed to meet the quality criteria.
Although these tires performed well in technical tests and received good praise from the players.
In addition to that, the methods for evaluating and measuring research and development results are very sensitive and accurate.
It took nine years and now DIGNICS tires are being launched.
DIGNICS has been reviewed and has completed everything.