Staedtler Mars 4 pc Combination Math Set, Stainless Steel, 56632BK Go to amazon.com Related posts The 5 best geometry set staedtler 2022 FeatureMath Set, 4 pc college combination set12" ruler, 6" triangle, 8" triangle, 6" protractorStainless Steel DescriptionMath set, 4 pc combination, stainless steel. 12" ruler, 6" triangle, 8" triangle, and 6" protractor.