Because early generations of phototypesetters could not change text size and font easily, many composing rooms and print shops had special machines designed to set display type or headlines. One such model is the PhotoTypositor, manufactured by Visual Graphics Corporation, which lets the user position each letter visually and thus retain complete control over kerning. Compugraphic's model 7200 uses the "strobe-through-a-filmstrip-through-a-lens" technology to expose letters and characters onto a 35mm strip of phototypesetting paper that is then developed by a photo processor. The 7200 is a headliner machine that read the character width form the filmstrip as the character is flashed onto the photographic paper so the unit knows how many motor pulses to move the paper. The most common unit was a low-range unit that went up to 72 points but there was also a high-range unit that went to 120 points.