Quick Answer: Vibrocore acts to improve the comfort and performance of your handlebars in a number of ways. First, Vibrocore reduces the transmission of harmful frequencies of vibration through your cockpit to your hands. Sustained vibrations at certain frequencies are proven amplify or cause hand-arm numbness, and in extreme cases arm-pump. Vibrocore, is a stiff, closed cell, pressurized foam, which also acts to reinforce handlebars and rims internally, increasing ultimate strength and fatigue life.Vibrocore can be found in the following handlebar models:Spike 35 Vibrocore (35mm Diameter / 820mm Length / 25mm Rise)Spike 800 Vibrocore (31.8mm Diameter / 800mm Length / 15, 30, 50mm Rises)Spike 777 FR Vibrocore (31.8mm Diameter / 777mm Length / 15, 30mm Rises)Oozy 780 Vibrocore (31.8mm Diameter / 780mm Length / 15, 25mm Rises)Oozy 760 Vibrocore (31.8mm Diameter / 760mm Length / 5mm Rise)For a more complete explanation of how Vibrocore works in handlebars, please visit this link. For an analysis of laboratory testing of Vibrocore handlebars, please visit this link.