Reading Rulers Duo Window - pk of 10 - 10 Color Pack (one of each) Pack of all 10 colors: Yellow, Celery, Grass, Jade, Aqua, Sky, Purple, Magenta, Pink and Orange. Narrow panel to assist tracking as well as provide relief of Visual Stress Wider panel for use as reading fluency increases, or for figures/diagrams etc New improved products, ideal for all ages and scientifically developed through a research based model Colors can be combined to create up to 30 tints