The Chartpak AD Marker Paper Pad with "Ink Block" Panel, 175 GSM, 7 x 10 inches, features 175 GSM bright white, smooth coated paper, ideal for marker rendering. The special coating provides clean crisp edges when using alcohol and solvent markers. Pad is constructed with an innovative, patent pending InkBlock panel which is inserted underneath the working sheet to prevent any marking or indentation to the sheet below. Made in USA. 24 sheets per pad.