Originally the definition of size 11/0 meant that there are 11 beads to the inch, but with delicas it tends to be more like 17 to 22 beads per inch, depending on the finish.
In general, there are appx. 7 grams in each 3" tube of size 11/0 and there are around 200 beads in a gram so a tube holds 1400+ beads per tube. The except to this rule is the precious metals coated delicas which are packaged with 6 grams to a tube.
Points to Consider About Delicas: