Polychromos coloured pencils are part of a unique colour-matching system that defines Faber-Castell Art & Graphic Products. Barrels are premium California cedar wood with Secure all bonding to strengthen the lead and help prevent breakage. 3.8 mm leads are break-resistant, water-resistant, smudgeproof and provide permanent rich colour. Each pencil features the highest quality pigments for unsurpassed resistance to fading. Colour lays down smooth and is easily blended for layered effects, highlights and transitions.