Materials
These are the materials I use most frequently... generally, if use different things, I write it in the picture's comment.
Pencils: Staedtler 3b
Mechanical pencil leads: Niji 2b; Faber-Castell HB
Brushes: Da Vinci synthetic; Apa Goya synthetic; Apa ox hair
China ink: Pelikan
Stylographic ink: Pelikan
Watercolours: Winsor & Newton (the cheaper onesi), Talens
Acrylic: Apa Ferrario
Tempera/ Gouache: Giotto, Talens, Pebeo...actually I don't use gouaches very often, and usually I mix them with acrylics, then I don't have a real preference.
Coloured pencils: Staedtler water soluble
Ecoline: Talens
Paper: The paper I use for my sketches is common copier/printer paper that I buy in reams; it's cheap and in my opinion it's the best choice if you use soft pencils. For inked or painted drawings I use generally rough Fabriano F4. Actually, I tend to recycle every kind of paper within reach, then it's hard for me to express a preference.