The most powerful explosive substance available, with a wider blast radius than C-1.
"Composition C4 is a white plastic explosive that is more powerful than TNT. This plastic-covered block has a threaded-cap-well at each end. Unlike C1, its sister composition, this one's odorless."
- Like the C-1, it is very stable and cannot be detonated using another explosive. It must be set of with a proper detonator.