Features1Different Training Methods: Vision training chart contains 20 sheets, a total of 40 kinds of charts, including 5 training methods, to meet your different needs. 2Training Suggestion: The training includes 3 levels of fineness, from low to high. It is recommended to use low level for vision less than 0.3, transition from low to intermediate for vision 0.3 to 0.6, and intermediate transition for vision higher than 0.6 to advanced training. 32 Color Backgrounds: The main training background of the vision training card is black and white. When you feel tired, you can use red and green to soothe. 4Waterproof: Each picture is covered with a film, which is durable and waterproof for cleaning. The card can be directly painted with watercolor brushes, and can be wiped off with a wet towel after painting. 5Not Easy to Break: The vision training chart is made of high quality coated paper, which is of good quality, not easy to break when used, and can be used for a long time.SpecificationItem Type: Vision Training ChartMaterial: Coated paperSingle Size: Approx. 28.5 x 21cm / 11.2 x 8.3inContents of Booklet:01 to 10 graphic connection training diagrams11 to 20 graphic tracing training maps21 to 26 training charts for the Schutl grid27 to 34 visual maze training maps35 to 40 alphabet chinese characters connection training chartsPackage List20 x pcs Vision Training Charts( Total of 40 patterns) 2 x Pens