The Pentel Twist-Erase Click Mechanical Pencil PENPD279TA features a side-click lead advance and a transparent barrel design for easy visibility. It includes a latex-free comfort grip and a convenient side button that allows the 0.9mm lead to advance effortlessly without changing hand position. The HB lead inside is equivalent to a No. 2 wooden pencil, making it suitable for standardized tests. This mechanical pencil also has a refillable, extra-long twist-up eraser for extended use and is compatible with Pentel Super Hi-Polymer Lead and E10 jumbo refill eraser.