The Corefx Rocker Board Features Treaded Eva/Tpe Foam Cylinder Base Allowing For A Challenging Balance Side To Side. Features A Large Textured Non-Slip Grippy Surface And 8 Cm Base Height Allowing For A Variety Of Foot, Hand Or Sitting Positions. Great Low-Impact Workout Helping Improve Your Strength, Coordination, Agility, Reaction Time, And Core Stability.