I found a few things I thought I'd post. Here is a picture of the vanguard band compared to the lower capacity band.
http://www.core.monash.org/placement.html
And some info from another site:
There are two issues here:
1) Band size
2) Fill volume
There are three sizes of Inamed Lap Bands. As I understand it, the size refers to the inner diameter of the band.
The 3 band sizes as per Inamed are 9.75 cm, 10.0 cm, and the VG (the Vanguard, which I believe is 11cm, but all the reps call it VG, no-one calls it the '11')
Fill volume:
The 9.75 and 10 cm bands can hold a maximum of about 4cc of saline.
The VG holds a max of about 10 cc of saline.
In medical circles I've always heard the Lap Band referred to by its size. For example, today in the OR we used "two 10's and one 9.75."