Asymmetrical rail volume. One side is more positive than the other. Available in various lengths. Width x Height x Length
Pictured above with "Trips"
Last picture is in use at Elevation Climbing Gym in Utah. Trips, Trips Big, and Trips XL
 
M36- 20"x18"x36" $300
M48- 20"x18"x48" $375
L60- 20"x18"x60" $425
L72- 20"x18"x72" $500
XL84- 20"x18"x84" $540
XL96- 20"x18"x96" $570
XXL120- 20"x18"x120" $870
XXL144- 20"x18"x144" $990