Kagamine Rin was the first voicebank developed and introduced to the Vocaloid consumer market. However, the package included two voicebanks: one for Rin and another for Len, both provided by the seiyū Asami Shimoda (下田 麻美 Shimoda Asami), Kagamine Len was unveiled later after Kagamine Rin. The package was priced at the same price as Miku Hatsune, even though there was two voicebanks in the box.
Text from wikia
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