A 2-pack set of 5.5" x 4.5" mylar nib smoothing sheets in 2 different grits - .3 micron is light blue and 1.0 micron is pink. These sheets are perfect for final passes when smoothing your nibs. These are much finer than micro-mesh, even the 12,000 grit Micro-mesh sheets or pads. These are considered abrasive to your nibs and pen bodies, even if they do not feel rough to the touch. For best results, ink or fill your pen with water before using and put the shiny side of the mylar down when using.