To date, these are my most popular tools. From left to right.
A small removable eraser for a pencil.
Eraser.
Artistic eraser.
A bag of coal dust.
Eraser in a wooden pencil.
Charcoal pencil.
Mechanical pencil.
Very small spray with water.
Pen for calligraphy.
Thin brush for watercolors.
Thick soft brush for watercolors.
The palette.
Watercolor 96 colors.
A small water bucket.
Paper for excess water.
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From @natichi