Anton Wewecz Soedibjo is a rubber-material artist from Malaysia, and he produces some of the most unique pen-making material in the world. Often referred to as "Anton" material by the penmaking community, these rods are each assembled / hand-formed one at a time through a lengthy process of rolling, cutting, folding and forming the vulcanite into beautiful patterns.

A single, complete rod measures approximately 8.5 inches and could be used to create one or more pens depending on its use as an accent or as the entire pen. 

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See examples of pens I have made with Anton's material: Anton on Vimeo