A tooling apparatus may include a pair of elongated tooling dies independently rotatable about a common central axis. Each tooling die may have a layup surface including a web layup surface and at least one flange layup surface oriented non-parallel to the web layup surface and configured to receive at least one composite ply to form a stringer layup half having a web and at least one flange. The tooling dies may be rotatable into side-by-side relation causing the webs of the stringer layup halves to be positioned in back-to-back mating contact with one another.