Our foam yoga blocks are strong enough to support your full weight, comfortable enough to use under your head or seat. We guarantee our Yoga Blocks will never get mushy, like the blocks other stores are selling. Our yoga blocks are made from a sturdy, scratch-resistant foam and are lightweight and easy to use. Foam yoga blocks provide support and stability for proper alignment, allowing you to practice your postures safely and effectively. They are also easy to use, store, and bring with you to class. Each block measures 4" x 6" x 9" (100mm x 150mm x 225mm) and are completely Phthalate free.