A 30 x 45 cm sheet of cork. 6 mm thick sanded on one side. Cork is a completely natural raw material, with unique properties. More than half the worlds cork comes from Portugal. The tree has a lifetime 170 - 200 years and the harvesting of the bark is absolutely harmless to the tree. The bark grows back within 9 - 10 years and can then be reharvested. More than 85% of its volume is filled with air which makes it light, impermeable to liquids and gases, elastic and compressible, provides thermal and acoustic insulation, it is a fire retardant and highly abrasion-resistant. Cork sheets can be easily cut and are perfect for pin boards, model making and even acoustic insulation.