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Wahl Flat Top Pens - These pens usually have numbered nibs or Signature nibs. Sizes range from #0 the smallest up to the #6 pens like these. The most common are the #2 and #3 ring top pens and the #3 and #4 clip type pens. They are made of metal, hard rubber or plastic and include a vast number of patterns and colors. The rubber pens come in black, mottled red and black and red hard rubber. The hardest are the larger #6 size pens.