Thank you all guys ! It was a squre acrylic pen blank,good quality and needed some work Inside it is not "hollow" (empty) but compact I shine it by my shelf.
Stunning! As all your previous razor converts are! And as I mentioned when I welcomed Doryferon: "... Doryferon has converted a lot of DE razors and brushes, customizing them as a professional would do (although an amateur)." Well done Doryferon!