The Smart Start series is a logical and friendly approach to handwriting. The lines are color-coded, with blue denoting the "sky," or top line. Green indicates the "ground," or bottom line. This color-coding allows children to quickly understand the concept of lines and spaces. When instructing letter formation, you will find it helpful to say, "Start at the sky and pull down to the ground." The high-quality paper erases easily, and the color-coding makes it easy for every child to practice good handwriting skills. Grade K-1 lines have 1" spacing. Grade 1-2 lines have ⅝" spacing.