Material: Gel. Type: Gel Ink Rollerball Pens. Nib Type: gel. Ink/ Lead Colour: Blue. Pencil Lead Degree (Hardness): HB. Further Details. However, the interiors are different. In an impressive and versatile manner, the styles switch from the Romanesque, Gothic and Renaissance epochs, through Empire and Classicism to what was then ultra-modern – the Art Nouveau.
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