Dear Mr. Arenon Koahom
Thank you for your reply.
The hardness of Si-901 is 5H, and Si-701 is 7H. In Japan, too hard product is not a good product. This fact have proved by the leading-edge study. Please let us know if you need 9H products because we had made 9H product in the past.
Best Regards,
Masashi Kurosawa