1. Executive standard: according to the national standard of GB/T 15720-2008 "Chinese Braille". 2. Product composition: protractor, compass, ruler, abacus, 30-degree triangular ruler, equilateral triangular ruler, blind engraving board, blind pen, tape measure. 3. Material: ABS engineering plastic. 4. Function: It has the functions of blind learning, drawing and annotation.
