A black grid is printed on the back of each sheet, creating easy to see grid lines on the front side of the sheet for sketching,  but grid lines will not show when copied.

Optional 8" x 9" coordinating rectangle can be added to the front,

Back print is done on a separate printer, so registration can vary within 1/8" inch to front print

Computation pads come in 4, 5, 8, and 10 squares per inch - 4x4, 5x5, 8x8, and 10 x 10