Developed by Vandoren in 1983 for jazz and commercial music. 
                 A thicker extremity and a more flexible pallet* than the Traditional
                 reed allow vibration over a larger surface area with maximum elasticity.
                 This type of vertebral column gives the musician much greater playing
                 flexibility as the resultant elasticity zone is very large. 
                 The JA stands for Jazz and the VA stands for Variety (entertainment
                 music) and ...Vandoren 

     ** pallet: zone where the waves are propagated with the greatest range. From the tip,
     the waves are absorbed further in the Java reed.