Copic Multiliner SP pen replacement brush nib is soft flexible and easy to install into your Multiliner SP brush pen. The Multiliner SP brush pen has a very flexible brush-shaped fiber tip. This tip acts like a Sumi brush; allowing you to draw with lines that are thick or thin, just like painting with a fine brush. Never throw your Copic SP away! Copic MLSPBN Multiliner SP replacement brush nib.