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The glass fibers in PrepPen are finer than human hair yet stronger than steel when it comes to cleaning power. The glass fiber cartridge can be extended out by turning as needed, then easily retracted when not in use. The refill is conveniently stored in the handle. Sand paper can be too rigid to directly contact and clean contours of inside edges. Conventional sanding only hits the high spots. PrepPen's glass fibers get into the smallest recesses. Save time and money by replacing folded sandpaper with PrepPen