If you need to trace something, you know how important the paper that you choose is to the process. With this 18# Alvin Budget Trans Bond 12X18 500/Pk medium-weight tracing paper, you'll have paper that is thin enough to see through sufficiently and thick enough not to tear as you draw. The working surface is fine enough to use a sharp pencil or to use ink. It also has great erasability characteristics if you need to make a correction. It's perfect for technical education use, and the 500 sheets will last a long time. Use this as a substitute for high-quality vellums and take advantage of the low price and tough sulfite bond that makes this tracing paper so useful and durable.