Staedtler Mars Lumograph Aquarelle Pencils - Hardness / Gradation - 6B - Lead Diameter - 3.6 MM is a high quality watercolour graphite pencil. Ideal for preliminary sketches for watercolour drawings as well as for classical watercolour painting and sketching. High break-resistance through special lead formulation and super-bonded lead. Wood from PEFC-certified, sustainably managed forests