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5 Stroke-Nib refills 
Compatible to to following pens: 
Intuos1 Pen (GP-300E)
Intuos2 Classic Pen (XP-300E), Intuos2 Grip Pen (XP-501E) and Intuos2 Designer Pen (XP-501A)
Intuos3 Classic Pen (ZP-300E) and Intuos3 Grip Pen (ZP-501E)
Intuos4 Grip Pen
Intuos4 Classic Pen
Intuos4 Airbrush