sentences:  In 2012, the school debuted helmets which featured a black stripe in addition to the black facemask, reflecting the helmets worn during the TCU championship years of the 1930s.Several TCU helmets designs also feature a small red "blood stripe" in the middle of the central black stripe, a reference to how horned frogs can squirt blood from their eyes/forehead onto potential predators.TCU was the last school in college football to wear leather helmets, switching to hard plastic helmets in 1946.