Binding doesn't get any simpler! Designed for the GBC ThermaBind system, Standard Thermal Binding Covers give a stylish and permanent ‘perfect bound’ look to documents. The transparent PVC front displays the title page and with the white silk-finish back, forms a secure spine. 1. 5mm A4 white covers will bind up to 15 sheets. Pack of 100. - Feature a 150 micron, transparent PVC front cover for easy reading of the title page. - Come with a Silk White 240gsm back for extra rigidity. - Can be stored in conventional archiving folders using a GBC FileStrip (up to 8mm covers only). - Available in a wide range of sizes from 1. 5mm up to 50mm so you can bind from 15 to 440 sheets. - Available in A4 and A5 sizes.