Cork Massage Ball Set, Lightweight Massage Ball for Deep Tissue Muscle Massage, Myofascial Release, Trigger Points, Muscle Knots, and Yoga Therapy, 2.4''+2.4''+3'' Lacrosse Massage BallsPremium Material Made of solid high density oak cork, a renewable and sustainable natural material that is non toxic and Eco Friendly. The cork material is pressed and polished by machine to ensure a firmer and more comfortable texture, making it perfect for massage therapy. By choosing this product, you can feel good knowing that you are supporting the environment and your body. Benefits of Massage By using massage ball for self myofascial relief,