This item is one 2.5″ tall tube. Sold by volume, not weight. Each tube contains approximately 7 – 8 grams (depending on color & finish).
There are approximately 100-110 beads per tube.
There are 15 size 6/0 Demi Rounds per linear inch.
If you were to string all the beads in one tube, you would get 6 2/3″ to 7 1/3″.
To make an 8″ kumihimo bracelet with size 6/0 Demi Rounds on all 8 warps, using the double-drop method, you would need 4 1/2 tubes of beads.