The Mercer Industries Zirconia Flap Disc features high quality zirconia grain with a resin on resin bond. It is cool cutting and resistant to heat and moisture. Does the job of a grinding wheel and a fiber disc. Trimmable plastic backing extends the life of the disc, is lightweight, and is cost effective. Made with a strong poly/cotton backing to extend the life of the disc. Mercer Industries is a 3rd generation family owned company that was built on core values of Quality, Performance, Delivery, Service, and Price. Founded in 1968, Mercer Industries offers more than 3,000 products for the flooring, industrial, automotive and welding markets. Mercer, formerly known as Mercer Abrasives, is committed to serving its customers and providing quality products. For more information, visit mercer industries dot com. We're here to support you. Please contact our team at info at mercer industries dot com with questions or comments. Claims for warranty must be made within 90 days of the date of purchase. Proof of purchase required. This warranty does not cover any product that has been subject to misuse, neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.