-. Binding : Office Product
-. Brand : TWSBI
-. Color : Demonstrator, Aluminum Silver
-. EAN : 4711467444240
-. Feature : Our ever popular 580 now has aluminum milled parts (Grip, connector, piston rod) / Piston filler type fountain pen. Easy twist to fill, no hassle. / 580 has improved the smoothness of cap thread turning / 580 has increased ink capacity, about 30% more than 530 / Comes in EF, F, M, or B nib sizes. Please look at other listings for different size
-. Label : TWSBI
-. Manufacturer : TWSBI
-. MPN : M7444240
-. PackageQuantity : 1
-. PartNumber : M7444240
-. ProductGroup : Office Product
-. ProductTypeName : WRITING_INSTRUMENT
-. Publisher : TWSBI
-. Studio : TWSBI
-. Title : TWSBI Diamond 580AL Silver Fountain Pen nib EF
A quick no brainer guide in choosing nib sizes in an overly complicated fountain pen world: If you write small, go with an EF
 For the normal writer, F is the most popular
 If you tend to lean on a bigger font, M will be perfect 
B is for statements!! Sign a check in B, write a header in B, do some coloring/shading in B
 Stub nibs are italic in writing style (have a special card or invitation to write?)