Adrums (2010)
Thump, the lowest drum, has a black leather head. It’s body was (I believe) a water tank, probably from a commercial fishing boat.
Squat has a cowhide head with hair. It’s body was 20lb propane tank.
The drum seen left front has a goatskin head with a circle of black leather glued to it. Its body is a section cut from the lower end (including some of the curve of the rounded bottom) of a pressurized gas tank.
The last drum has a goatskin head with hair (hair side down) and a small circle of leather glued to it. Its body was a 14.9 cu ft helium tank.