A profile for forming a channel letter box is disclosed. In some embodiments, the profile can have a rule formed of a first material. The rule can also have a substantially flat first surface and a rule axis. The rule axis can have a rule length. The profile can also have at least one rib formed from a second material and bonded to the first surface. The rib can be disposed substantially parallel to the rule axis and have a rib height smaller than the rule height.