The Manduka Cork Yoga Block is made of sustainable cork. This high-quality yoga block has a firmness not found in foam blocks, and allows you to feel secure in the support it generously provides. Portable fit Sustainable, fine-grain cork material Weighs less than coarse-grain cork commonly used for blocks Resilient solid structure Easy-to-grip textured surface Comfortable contoured edges Cork Yoga Block Height: 9 in. / 22.9 cm Length: 4 in. / 10.2 cm Width: 6 in. / 15.2 cm Weight: 40 oz. / 1134 g Mfr. Part Number: 133021077 UPC or EAN No.: 846698000973 Note: Products sold through this website that do not bear the Apple brand name are serviced and supported exclusively by their manufacturers in accordance with terms and conditions packaged with the products. Apple’s Limited Warranty does not apply to products that are not Apple branded, even if packaged or sold with Apple products. Please contact the manufacturer directly for technical support and customer service. Warranty: One year Cork is a renewable, sustainable material, which comes from the bark of a Cork Oak Tree. There are no toxic chemicals used in the manufacturing of Manduka cork yoga blocks.