Mercer's Floor Maintenance Pads are available in a wide variety of grades to give the floor maintenance professional the correct pad choice for specific uses. Color coded to facilitate fast and accurate grade choices when changing from one type of floor job to another. Double sided and open web construction, Mercer Pads are efficient and easy to clean under running water. White (W): For dry polishing/buffing or with fine water mist to ensure high gloss. Also used as a cushion between machine and sandscreen or double-sided sanding disc.Red (R): For dry buffing, spray buffing or light scrubbing.Green (G): For wet scrubbing.Blue (U): For cleaning prior to recoating and general-duty scrubbing.Black (B): For heavy tripping.Hi-Performance lack (HP): Extremely aggressive, open and porous pad for difficult jobs.