Jet Hematite Czech Cube Beads - High quality Czech glass beads that have been pressed and tumbled into a cube shape. Whether you are stringing or weaving, these cube beads will captivate your imagination. Use these beads in place of other 4mm beads to create a boxier more angled design. Czech Cube beads have 1 hole and measure approximately 4mm, though size variations may occur during the manufacturing or tumbling process, potentially reducing the size to a range of 3.6-3.8mm. They come in a pack of 100.