Alvin geometry drawing set. Handy drawing kit features an easy-grip design. Made of clear, durable plastic, with solid "stripe" accent. Includes 12" ruler, 45/90 and 30/60-degree triangles, and a 6" protractor. Graduated in both inches and centimeters. Alvin FL41 geometry drawing kits are the perfect combination math sets for classroom, schools, home, office.