ULTRA GRIP WALL BALLThe COREFX Ultra Wall Balls feature an interior filling that helps the ball keep its shape, and is forgiving enough to safely catch high speed throws or bounces. With its ultra grip outer construction, made of extra grippy PU material you can perform your functional exercises to your best ability, no matter how sweaty your workout may get. Description The COREFX Wall Ball represents the evolution of strength and conditioning medicine ball training.