For general duty scrubbing or heavy spray cleaning jobs. Great for scrubbing rough surfaces such as concrete to remove scuffs and other marks. These blue cleaning pads fit directly onto our 15" floor buffing machine, when it is purchased with a 15" floor buffing pad holder. They are made from 100% post consumer and industrially recycled waste. All of the synthetic (polyester) fiber used in our floor scrubbing pads, as well as our hand and utility pads comes from recycled materials. Primary sources of these materials are recycled soda and water bottles.