The Zenzation Twin Yoga Block has beveled edges that allow quick and easy gripping. Odorless, dense, high-grade foam supports and cushions your body. Transforms yoga poses by adding stretch and extension. Place under the hips, hands, heels or between the hands. Stabilize your body while achieving proper alignment. Each pack has 2 pcs,3" X 6" X 9". Yoga blocks can provide support and stability for yoga beginners, allowing you to practice yoga and Pilates safely,help you improve your balance & flexibility. A good yoga block helps with optimal alignment, deeper poses and increased strength.