Our Standard Pelvic Blocks are constructed of 1" high-density foam shaped over a hardwood interior. They are covered in black Spirit Line Naugahyde® and have non-slip bottoms. The size of each pelvic block is 8" x 5½" x 3½". These blocks will provide years of service in your office and, as with all of our products, come with our standard one year warranty on construction. Our blocks are used by chiropractors everywhere for positioning of the pelvis during treatment.