Choosing a good box of chalk involves considering several factors to ensure that it meets your needs and performs well. Here are some key aspects to think about:   1. Material: Chalk is typically made from calcium carbonate, but there are variations. Some high-quality chalks might be made with different compounds or additives for better performance. For example, dustless chalk is designed to reduce the amount of chalk dust produced during writing. 2. Durability: Look for chalk that is sturdy and doesn't break easily under normal pressure. This ensures that you can write comfortably without wasting chalk.   3. Smoothness: Good chalk should glide smoothly on the board without skipping or leaving gaps in the writing. Smoothness also affects how easily the chalk can be erased.   4. Visibility: Consider the visibility of the chalk on the board. Bright white or colored chalks tend to be more visible against the board surface, making them ideal for classroom settings or large gatherings.   5. Erasability: Check if the chalk erases cleanly and leaves no residue behind. This is especially important for maintaining a clear board for future use.   6. Dust Production: If you or your students are sensitive to dust, opt for low-dust or dust-free chalk options. These are designed to minimize airborne particles while writing.   7. Size and Shape: The size and shape of the chalk can affect how comfortable it is to hold and write with. Some people prefer thicker pieces for easier gripping, while others might find thinner pieces better suited for detailed work.