• 1957　Started producing Tennis Strings.
• 1971　Leoina 66 was introduced.
• 1975　Leoina 66 became one of the best selling strings in USA market.Contracted with Mr. John Newcam (Australia).

• 1984　Toa Gold was introduced.

• 1986　Leoina Bio which had more durable than Natural Gut and had same Playability as Natural Gut was introduced. Contracted with Ms. Carlson (Sweden).

• 1989　Leoina Ceramics were introduced.
• 1990　Leoina Shockless was introduced.

1981　Leoina Toalson 1.2mm which was the thinnest gauge in the world was introduced.

1985　Leoina Leiser was introduced. Contracted with Ms. Lisa Bonder (USA).

1988　Zyex was introduced.

1991　Leoina Shockless 2 and Leoina Cosmo were introduced. Contracted with Mr. Andre Agassi (USA).