Features: Baby Visual Stimulation Card,Black White Visual Stimulation,High Contrast Baby Flashcard,Black White Card Newborn,Sensory Development Toy,Black and White Colorful Early Education Recognition Card ，early education, recognition cards, cognitive development. Between the ages of 0 and 3 is the best age for baby brain development. Activate the baby visual nervous system through black and white card and color card Promoting whole brain development and matchings light and shade,Perception of graphics. Improve observation, curiosity, and the ability to explores .It is great for your baby vision development and brain development! Harmless to health. cards feature bold black and white designs with high Contrast of color to capture your little baby attention and encourage learning. Specifications: Material:paper Size:Approx.14.5x14.5x1cm/5.71x5.71x0.39in Color:1/2/3/4 Stage1 suitable for 0-3 months Stage 2 suitable for 3-6 months Stage 3 isuitable for 6-12 months Stage 4 suitable for 12-24 months Package Includes: 20sheets/set Baby Visual Stimulation Card note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to difference between different monitors, the picture may not reflect the actual color of the item.