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10 scientifically selected colours; can be combined to make 30 tints equally around the colour spectrum The only overlays made from crystal clear PET, not PVC. Simply remove protective film and place over text and read. Each overlay has a gloss and a matt side. A great Dyslexia, Visual Stress and Irlen tool. Make reading easier and more comfortable Created by Crossbow Education – trusted UK school supplier and Dyslexia and Visual Stress Specialists UK Education Resources Award-winning product Overlay Size 216mm x 149 mm