G F Smith Colorplan - A pack of 4 sheets of A3 - 297 x 420mm - 135gsm / 180 Micron. This iconic range of premium coloured papers and boards is considered to be indispensable within the design industry. Choose from 50 colours. Made in England. Acid free. 100% ECF virgin fibre. As well as being fully recyclable and biodegradable, Colorplan is FSC certified, meaning that it is made with, or contains, pulp from well-managed forests. It is also Heavy Metal Free and because the bleaching process avoids the use of harmful chlorine, it is classified ECF.