Our crack volume is the the perfect depth for full on hand jams (8" deep). It is adjustable from 1"-8" wide. It come with replaceable plates.  
 
Crack Volume-
CV- 48"x 21"-28"x 9"- $595ea
 
Package #1 - 3 Pack
3 crack voulmes- $1,299
 
Package #2 - 5 Pack
5 crack volumes- $1,999
 
Package #3 - 10 Pack
10 crack volumes- $3,499
 
By request only-
K-Plates- Sandstone plates to give a varied dimension. 
Training Crack- volumes that can be adjusted with a turn of a knob.