These custom dice were designed by Joseph Fjelstad, creator of Microgammon, and while they were originally intended for that game, we find they are excellent in many other applications. "Inspired by our D3's, these rounded D4's look and feel similar to a typical D6 but the rounded ends allow only four stopping sides, much better rolling than the old caltrop style that comes in most polyhedral sets (easy to pick up and won't kill your feet either!). Available in Black with white pips or White with black pips." See our other listings for his multi-variable X-Dice and our clear plastic Dice Box.