Description: 【 Design for the Visually Impaired】: This Braille Ruler Set is specifically designed for the visually impaired, featuring clear tactile markings and braille indicators to facilitate easy measurement and learning 【Comprehensive 4 Piece Set】: The Braille School Braille Ruler Set includes a protractor, a straight ruler, an right triangle ruler, and a special angle right triangle ruler, providing all essential tools for various mathematical tasks 【Tactile Features for Easy Use】: Each Math Geometry Tool Ruler in the set has raised vertical lines and notches that allow users to feel centimeter measurements easily. Even numbers are marked with braille dots at the bottom for quick identification 【Material】: Made from sturdy pp, the Braille School Braille Ruler Set is designed to withstand regular use while maintaining their shape and functionality over time 【Compact Size for Convenience】: With a straight ruler length of 20cm/7.87inch, this Blinds Learning Supplies is compact enough to be easily stored or carried in a bag, making it ideal for both classroom and home use Specification: Straight Ruler Length 20cm/7.87inch Package Includes: 1 Braille Ruler Set Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.