A 175gsm bright white, smooth coated paper, ideal for marker rendering. Coated paper provides clean, crisp edges (no spiderwebbing or bleeding) when using alcohol or solvent based markers. InkBlock panel you slot underneath the working sheet to prevent any marking or indentation on the sheet below. Bring out the best and brightest of Spectra AD Markers on these pads! See how to us the InkBlock panel in the video below, it's easy!