Pentel High-Polymer Super Leads are great for paper surfaces - formulated with polymer resin bonded to carbon and graphite particles that never need sharpening!
These leads break less, last longer, write smoother and produce terrific dense black lines that resist smearing and fading.
Pentel high-polymer leads are available in 0.3mm, 0.5mm, 0.7mm and 0.9mm thicknesses and a wide array of hardnesses.