Czech seed beads in the shape of a short-cut cylinder are called PRECIOSA Three-Cut Beads. They are hexagons, cut, with a round holes. Use higher-quality thread such as Fireline with these high-quality glass beads.
Sizes: 10/0 3 Cuts are 1.8-2.0mm and 9/0 3 cuts are 2.0-2.2mm
"The PRECIOSA Three-Cut Beads are cut again on special cutting wheels while strung on a wire which reduces the edges at the ends of the seed beads and the cutting of several randomly placed facets. Each PRECIOSA Three-Cut Bead has a unique shape. PRECIOSA Three-Cut Beads are among the most expensive seed bead products due to the demanding nature of their production."