16 CFR § 1202.3 - Definitions.
(b) Bridge means the matchhead material held in common by two or more splints.
(c) Broken bridge means a bridge that has become separated.
(d) Caddy means a package of two or more matchbooks wrapped or boxed together at a production plant.
(e) Comb means a piece of wood, paper, or other suitable material that has been formed into splints, that remain joined at their base, and that are designed to have matchheads attached to their tips.
(f) Cover means the paperboard or other suitable material that is wrapped around and fastened to the comb(s).
(j) Matchhead means the dried chemical mixture on the end of a splint.