This Wing Sung 3008 with screw on cap is a demonstrator pen made with clear acrylic body.
This pen holds the ink within the barrel of the pen and has an integrated piston that is used to draw the ink into the chamber straight from the ink bottle so neither convertor, nor cartridges are needed.
Nib has been ground for right-handed Arabic calligraphers and to ensure sharp lines compromising slightly on the smoothness of the nib. The glide can be improved by using low porosity paper and by polishing and fine-tuning the nib using fine sanding paper (included with the order).
We do not recommend this pen if you are rather heavy handed as you will find it scratching the paper.
You may find traces of ink on the pen nib as each nib was tested during grinding process.