Pentel Super Hi-Polymer Lead Refill, 0.5mm, Fine, 4B, (C505-4B)

This product is a set of leads designed for use on paper surfaces. The leads are made with a polymer resin that is bonded to carbon and graphite particles, which means they never need to be sharpened. This feature also results in less breakage, longer-lasting use, smoother writing, and dense black lines that resist smearing and fading. The set includes four different lead sizes, each suited to a different purpose: 0.3mm extra-fine for small details, 0.5mm fine for accounting and general writing, 0.7mm medium for students, and 0.9mm thick for drawing.