Blue - 7 Unusual Odd Numbered Dice Set - D3, D5, D7, D9, D11, D13 & D15 7 dice set. Includes the following dice D3, D5, D7, D9, D11, D13 and D15 All dice are between 0.75 and 1 inch in diameter. All dice were chi squared tested for rolling equal probabilities. The D3 is a D6 with Roman Numerals I, II, and III on it twice. The D7, D9, D11, D13 and D15 are a special design with an odd number of sides so the numbers are engraved on the edges to show on top when rolled.