The box contains what seems to be a very small (compared to the massive shore battery version) steam canon. It doesn't seem quite fully assembled, and it's a bit larger than normal canons, but nowhere near the size of the shore based ones. How it'll fire is in question, but only slightly. It'll definitely fire and do some damage to hulls.<br/><br/><br/>The more normal canons, filled with firedust, aim and fire on the sitting hull, the sailcutter's aimed low to cave in the hull, and it slowly takes on water.