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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 UK Education Resources Award-winning product; Assured by British Dyslexia Association 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