NJS is the prime certification stamp for track racing components, which means that they meet the strict performance requirements set by the Japanese Keirin Association. Not many factories outside of Japan make NJS-certified parts, but Campagnolo is of course one of them.
A few NJS component brands are well-known: Sugino, Nitto, Dura Ace, or Suntour Superbe, but when it comes to the frames, the subject becomes more esoteric. Keirin is hugely popular in Japan, so it is a country with many skilled frame builders. Unfortunately, Keirin frames - like all things Japanese - are somewhat inaccessible to foreigners. The builders do not necessarily advertise, and the very best Japanese frame building may be going on in anonymous workshops, where you would never expect such magic to happen.
But here is a comprehensive page, where you can feast your eyes on a selection of wonderful track frames, and satisfy all of your other NJS needs & wants.
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