Custom & Unique {Standard Medium} 7 Ct Pack Set of [D4, D6, D8, D10, D12, D20] Assorted Polyhedral Shapes Playing & Game Dice Made of Obsidian Gemstone w/ Simple Classy Design [Black & White] NUMBER OF SIDES: Please look at the number of sided the dice being sold in this listing have. Research what you need the dice for to make sure these dice have the right number of sides and are the right dice for your needs. MATERIALS: Numerous materials have been forged into dice throughout history. This includes such things as bones, glass, wood, seeds, and metals. Today, the most widely used base material for dice manufacture is plastic. For a plastic to be suitable in dice manufacture it must have good impact strength, be easily colored, and heat stable. These dice are manufactured with the best materials available to the manufacturer and guaranteed for life. WARRANTY: These dice have a lifetime warranty that is guaranteed by the manufacturer. This means that if the products come with a manufacturer defect upon opening the package you may request replacement from the manufacturer. TOP 10 MOST POPULAR DICE GAMES: Yahtzee, Backgammon, Farkle, Boggle, Craps, Bunco, Monopoly, Dungeons and Dragons, Bluff or Liars Dice, and Strat-O-Matic.