Excellent pad for usage in engineering classes and labs. Smooth writing paper is plain, except for printed outline box on top of sheet, and has 5 square\/inch grid layout printed on back of sheet. Back grid shows through to front as dimensional guide for drawings and layouts. 34 pt chipboard backs add stability. Glued along 8.5" (top) edge and 3-hole punched to fit in standard 3-ring binders. Each pad is poly-wrapped.