VIPER 640 J-5 JIBDesigned with the same shape and twist as the multiple World and Continental Champion J4 jib, the J5 takes durability and performance to another level with the introduction of Aramid fibers. You'll enjoy a longer lasting racing shape and superior performance throughout the wind range. The J5 has been impossible to beat since it's introduction. It comes with 3 different stiffness options for your top batten so you'll be well suited to use it in any