This is helpful to keep track if you are using multiple pencils with different hardnesses. Some of these pencils include a lead hardness grade indicator that can be turned to display the 2B, B, HB, H, etc. The 2B hardness level offers a nice compromise that is not so hard that it is difficult to write on paper but not so soft that it is constantly breaking. You may remember from buying school supplies the requirement of a “number two” pencil refers to the hardness. The most common hardness is 2B, as shown in the image above. Just like with standard pencils, mechanical pencil leads are available in many different hardness levels to suit a particular writing or drawing project. Lead refills are stored in small tubes as shown below, so they are ready to top up the supply within the pencil itself. If you find the lead regularly breaks when you write, you may want to go with the thicker 0.7 mm option. This in turn will determine the average line thickness. The most commonly used standard lead sizes for general writing are 0.5 mm and 0.7 mm.
Lead diameters are measured in millimeters and can range from a very fine 0.2 mm for technical work up to 2 mm for drafting lead holders. Most mechanical pencils are designed to only accept one diameter of lead, however some advanced models can accept a range of lead widths. While called “lead” it is typically made from graphite. This keeps the projection from sticking out preventing it from becoming damaged while not in use and also not poking through a pocket fabric. Some models offer a retractable lead guide pipe that allows it to retract back into the cone of the pencil. However, some manufacturers have developed faster-advancing mechanisms to keep up with this writing style.
It tends to not work as well with cursive writing as it is not lifted off the paper enough times to advance the lead appropriately.
This has the advantage of the lead not forming a tapered shape with causes inconsistencies in the line thickness. Some advanced models such as the Uni Kuru Toga (see below) offer a system that automatically rotates the pencil lead out of the holder each time the lead touches the paper. Generally, it comes down to personal preference as you what you find more comfortable when writing. The advantage of metal is that it does not become worn over time, as with rubber, and it tends to be less slippery if your fingertips become damp. The most common types are textured metal known as a knurled grip or a soft rubber grip. The grip is the most important component of the pencil as it is where most of your contact takes place. However, metal will typically make for a heavier pencil which is something to keep in mind if you are continuously writing for long periods. The higher-end models will typically use more metal elements as they tend to last longer and offer superior durability. Most mechanical pencils are constructed from plastic and metal components. Here of some features and components to be aware of when selecting a specific pencil:
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