D9 (9-sided die) Heptagonal Prism

D9 (9-sided die) Heptagonal Prism 3d printed Mathematical Art Dice
This heptagonal prism is designed so that the center of mass is the same height above the ground whether it lands on a rectangular face or heptagonal face. This does not work as a fair 9-sided die since the each heptagonal face has a higher probability of landing face down than any rectangular face.

You can label the heptagons so that the numbers are balanced about the mean. Ex: 1 and 9 on the heptagonal ends and 2 through 8 on the edges of the rectangles. This ensures that the average rolled value is 5. See also labeled version.
cm: 1.46 w x 1.382 d x 1.496 h
in: 0.575 w x 0.544 d x 0.589 h


  • White Strong & Flexible

    White nylon plastic with a matte finish and slight grainy feel.


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