These rondelles have a presence! Measuring 23 mm across and 11 mm thick, you know you are using a rondelle! These are a hexagon, and each of the sides is flat with a rounded corner. The rondelle is fatter in the center than it is on the edges. The bead channel will accommodate a 0.5 mm cord. These beads were made in molds in Czechoslovakia during the 1980s or early 90s. The color is a deep, saturated forest green. Price is per bead.