Description: 【Designed for the Visually Impaired】: This stationery set is specifically crafted for individuals with visual impairments, featuring clear tactile markings and Braille indicators to facilitate easy measurement and learning 【Nine Piece Set】: The Braille Ruler Set includes essential tools such as a protractor, ruler, right angle triangle ruler, special angle right angle triangle ruler, compass, abacus, soft tape measure, and a 4 line Braille to support various mathematical tasks 【User Friendly】: Tactile Measuring Tool with raised vertical lines and grooves that allow users to easily feel centimeter measurements. Even numbers are marked with Braille dots at the bottom for quick identification 【Material】: Made from PP, this Drafting Instruments is designed to withstand regular use while maintaining its shape and functionality over time 【Educational Use】: Blind Learning Ruler set is suited for educational environments or personal use at home, provides visually impaired students with the necessary tools to engage in mathematical learning effectively Size Chart: Ruler length: 20cm/7.87inch 4-line Braille board: 21.8x4.4x0.7cm/8.58inchx1.73inchx0.28inch Package Includes: 1 protractor, ruler, 1right angle triangle ruler, 1special angle right angle triangle ruler, 1compass, 1 abacus, 1 soft tape measure, 4 line Braille Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.