Plastic film in roll form and perforated for easy snap-off. Regular is for DentalEZ, Ritter, Cascade, donut and cup, and others. Large is for DentalEZ, "wedge," Ritter, Pelton & Crane, Webber, Johnson & Johnson, Siemans, Densco, and others. Jumbo is for Ritter, SS White, Midwest, Relax-a-Dent, Siemans, and others.