GBC HiClearâ„¢ Covers are made from crystal-clear, durable PVC. They are both spill and tear-proof, designed to show off your title pages and enhance the colours and artwork whilst protecting your valuable work. HiClearâ„¢ Covers are available in 3 standard sizes and 4 thicknesses, from a Lightweight 150 micron up to a Super Heavyweight 300 micron, ideal for frequently handled documents requiring a premium finish.