NOTE: Some expressions will not work with certain heads or eyebrows. Try before you buy. This is a basic single trigger facial expression pack. Each trigger can be used on its own or combined with another trigger to make a unique facial expression. All expressions ending in S means that it will play for a short amount of time. All expressions ending in L means that it will play for a longer amount of time. All expressions starting with B are for eyebrow movement. All expressions starting with E are for eye movement. All expressions starting with M are for mouth movement.