Shower units? (9)
I believe the answer is:
raindrops
(Other definitions for raindrops that I've seen before include "Descending from heaven" , "''... keep fallin' on my head'' (from Butch Cassidy and the Sundance Kid)" , "Pardon, Sir, are they small quantities of water, strangely?" , "Liquid precipitation" , "'. . . . . . . . . keep falling on my head' (song)" .)