The Healthy You Pelvic Sacral Blocks is a positioning tool for a variety of chiropractic techniques to correct, strengthen, and stabilize the lumbar spine Constructed of a block wedge covered in durable foam and vinyl thats and easy to clean and maintain The base has a soft nonskid material that prevents slipping but will not scratch/damage table upholstery Sold as a pair Color: Black Dimensions: 9"L x 4.5"W x 3.75"H