Marrow 1 is the third EP of the Illinois-based industrial band, , and the first in their Marrow series. All songs are acoustic. "Ammunition" and "The Shake" are acoustic covers of I:Scintilla songs from previous albums. "Girl U Want" is a Devo cover, and "Spit It Out" is an IAMX cover.
The artwork was illustrated by singer Brittany Bindrim.