Royal ArroWorthy Microfiber 12Pack 14" x 3/8" Nap (14MFR3) Royal ArroWorthy Microfiber 12Pack 14" x 3/8" Nap (14MFR3). Microfiber 3/8" nap x 14'' Professional white microfiber fabric For all paints and enamels Shed Resistant No-caps model 14MFR3 Price is for a pack of 12 roller covers.