5 x 2.5mm. These are very old! circa 1950's. Cylinder in shape with a nice golden color that is rich with age. Each hank is 10inches long with 12 looped strands per hank. Lots of bugles. These bugle beads are all temporarily strung in hanks for your beading and weaving convenience. Simply tip your needle through the string and take off what you need. This is one of the nice features of beads sold in hanks.