It's easy to build full sheet plywood walls but let's face it; it's fun to add some terrain change and that's just what a volume will do.
Volume #1 is about the size of a volleyball and can accomodate 3 holds. It attaches using one bolt. It is quite possibly the most cost effective Volume on the market!
See above thumbnail image for measurements.
Note: The Volume does not include the holds to bolt on to it.