Excellent pad for usage in engineering classes and labs. Smooth, green 15# 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. Sheet size is 8.5″ x 11″. 200 sheets per pad.