LETTER-SIZED - One 8.5" x 11" pad with 50 sheets, 4x4 quadrille (4 squares per linear inch); blue lines on white paper DOUBLE-SIDED - 50 Sheets per pad, printed on both sides GLUE-BINDING - Sheets are secured along top edge (8.5" side) with glue binding for easy removal from the pad without worry of dealing with perforated sheets requiring precise tearing. THICK CHIPBOARD BACKING - Sheets are supported by a heavy backer board to ensure stability and easy removal from pad VERSATILE - Use for engineering or technical drawings, drafting, drawing blueprints, crafting, or creative drawings One letter-sized 8.5" x 11" quadrille ruled 50-sheet pad with blue grid lines (4 squares per linear inch). Each sheet is double-sided and sheets are attached to a heavy-duty chipboard backer board to help prevent the pad from bending. Glue-bound along the top (8.5" side), the sheets are easily removed from the pad without the worry of dealing with perforated sheets requiring precise tearing.