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Step 1: 

The PC-1M Extra Fine is slightly wider than a ball point pen.  Best for writing.

Step 2: 

The PC-3M Fine point is thicker than than the 1m or a ballpoint but not quite as thick as a Sharpie.  Again, best for writing.

Step 3: 

The PC-5M Medium Point has approximately the same size nib as a Sharpie marker.  Good for drawing and art work.

Step 4: 

The PC-8K Chisel Point creates thick solid lines.