Ideal for students and standardized tests, Xtra Strong feature strong 0.9mm leads that resist breaking and create bold, eye catching lines. The #2 lead never requires sharpening and is always ready to write when you are. The lead advances smoothly with a simple click, does not smudge, and erases cleanly. Students of any age will love the bright colorful barrels and contrasting clips. Source: The NPD Group/ Retail Tracking Service / U.S. Actual Unit Sales (Retail & Commercial Combined)/ Jul 2016 Jun 2017.