These rags are made of recycled colored flannel material and are one of the most popular types of general purpose rags They are popular for oil and grease cleanup and often used in machine shops and for truck polishing These rags are made of recycled flannel material, so they are broken in, making them soft and absorbent An all-purpose use rag Very popular because of the quality of the rag that you get for the price and the eco-friendliness of them Recycled mixed colored flannel material clothing cut into rag sized pieces. Great all-purpose wiper for general wiping and polishing. Great for cleaning oil and grease. Popular with machine shops and mechanics.