Rondelle beads. These have a disc or doughnut condition, and the width has a tendency to be larger than the peak. These are generally much like donut beads, which can be donut-shaped with a larger gap in the center. The a person vivid place was the Harry Potter LEGO knock-off https://thejillist.com/story8452209/a-secret-weapon-for-yellow-beads-types