By far the best for sketching and classic sketching! Koh-I-Noor also produces the best Red Chalk, which you can find as Russet Sepia in its 5.6mm format or as Red Chalk in a wooden pencil. The best lead holder to use with these 5.6mm tips is the Koh-I-Noor 5347. Use a simple pencil sharpener from any reputable company (KUM or M+R). Press the button to extend the tip about 3 to 4 cm out of the pencil and sharpen them like a regular pencil! Stop frequently to check before making it too sharp, and you're ready for sketching. Dark Sepia is perfect for portraits and urban sketching too! Prefer papers with a little tooth, not completely smooth, although it also works fine on smooth paper. The tooth will give volume and flexibility to the tone, while on smooth paper, everything will be flat like children's drawings.