AmazonBasics Yoga Blocks, Set of 2 Set of 2 yoga blocks help promote better balance, proper alignment, and deeper poses Made of durable, high-density foam for reliable support and long-lasting performance Slip-resistant surface help ensure a secure hold; round edges for a comfortable, steady grip Lightweight and modular; use separately or stacked together in a variety of configurations Large enough to comfortably sit on; measure 4 by 9 by 6 inches each (LxWxH)