The World's No.1 Selling Scrubber for Cast Iron Cookware, Dutch Ovens, Casseroles, Stainless Steel Cookware, Woks and more. Superior Quality. Lifetime Warranty. Makes Cast Iron Cookware Cleanup Quick and Easy. Manufactured with 316 grade stainless steel - the highest food service grade stainless steel. Preferred by professional and home chefs. Comes With the Knapp Made Lifetime Replacement Guarantee The Patented CM Scrubber™ - Recommended by Cooks Illustrated Magazine. Featured on Americas Test Kitchens.