This is a simple product called Sprite Foam Yoga Brick

Our top-selling yoga prop, the 4-inch, high-quality Sprite Foam Yoga Brick is popular among yoga novices and studio professionals alike. An essential yoga accessory, the yoga brick is a critical tool for finding balance and alignment in many common yoga poses. Choose from 5 color options.

• Standard Large Size: 4" x 6" x 9".
• Beveled edges for ideal contour grip.
• Durable and soft, scratch-proof foam.
• Individually wrapped.
• Ten color choices.