Writing tools. It is made of collodion.
The combination of the nib and the organic transparent pen tube is coated.
The adhesive is fixed together; In the center hole of the nib
Inserting a section of porous tube can promote the use in the lumen.
Clear water quickly seeps into the nib. In the pen tube
Set a colored buoy in the inner cavity for reference.
The water level in the indicator tube fluctuates. The upper end of the pen tube and
The end cap is threaded.