Derwent Lightfast Colour Pencils, Professional Quality, Wooden Box Set of 100, 2305693. Size: 100 Count (Pack of 1) Style: Wooden Gift Box Brand: Derwent MPN: 2305693 EAN: 5028252600286 UPC: Does not apply. Writing Instrument Form: Colored Pencil. Age Range (Description): Adult. Item Weight:? 5.2 pounds. Product Dimensions:? 18.35 x 9.6 x 2.52 inches. Item model number:? 2305693. Number of Items:? 100. Size:? 100 Count (Pack of 1). Date First Available: September 24, 2019. 100% Lightfast, all colours are professional quality and comply with ASTM 6901 and Blue Wool Scale ISO 105. Revolutionary Oil-Based core which creates rich vibrant colour. Colours can be mixed on the page to create a paint-like effect. Strong point for detailed drawing and layering techniques. A rich colour selection, with quick and opaque colour laydown. Derwent Lightfast pencils have been formulated to be 100% lightfast. The revolutionary core is resistant to prolonged colour change ensuring artwork will not fade for up to 100 years under museum conditions. Available by the end of September. All colours are professional quality and comply with international lightfast testing standard, ASTM D6901 and Blue Wool Scale ISO 105.