Designed to be durable with strong 0.9mm leads that resist breaking. Ideal for detailed work or any time extra tidiness and accuracy are needed, the BIC Extra-Precision Mechanical Pencil leads that lay down smoothly, do not smudge and erase cleanly. BIC Extra-Smooth Mechanical Pencils is smooth-writing leads that do not smudge and erase cleanly. Students of any age will love the bright colorful barrels and contrasting vibrant clips.