These are available for the following vehicles

SR20DE(T) Inner springs 2.5 30.7 19.2 6.4 23.6 1009M-N008

For the specs of these springs please see the last picture.

This is what Jun has to say about their product. When valve speed increases by high rotation-ization of engine, 'Jumping' may occur by the factory valve springs. Moreover, since inherent pitch is low, 'Surging' may occur in a high rotation region. In JUN, the valve spring with which the load optimal at the time of a set and a valve lift is acquired was manufactured. Even when the amount of valve lifts increases by using a high cam, since the adhesion margin is secured enough, the JUN valve springs does not have degradation and its durability is also improving.

Get these and all your JDM from RHDJapan!