It's not a specific pen. Any pen made with steel balls made by TISCO would qualify. They don't seem to publish statistics. I found a document purporting to answer questions by investors [1], where their answer to questions like "did the media attention lead to increased order volume?" or "how large are the cost savings?" is basically "thank you for your interest, our proposed standard has already passed national review" without giving specifics. Those investors probably weren't satisfied with the response.

[1] http://tgbx.tisco.com.cn/upload/news/2017031406023863.doc