With the "FULL PACK" you'll receive six different inserts with your IBB barrel;
 
*Standard (cylindrical) bore with inverse taper
*Hexagon with no taper
*Hexagon with inverse taper
*Heptagon, seven sided, with inverse taper
*Standard bore with no taper
*Standard bore with a less aggressive taper 
 
The barrels come in 63, 64, 65, 66, 67, and 68 mm's
 
The cost of the Full Pack is $415.00