The Casablanca G501 4-Inch Opal Schoolhouse glass can be used on K1K Fitter within the Casablanca family of fans and takes one standard medium base 60-watt incandescent bulb. This item is sold one per package and fits the K1K Fitter which can be bought separately. Casablanca Fan Company is dedicated to bringing consumers quality in every detail. Each Casablanca fan is created with an eye for timeless design, assembled with care from the highest quality parts, and engineered for superior energy efficiency, to be a classic fixture in the home that is enjoyed for generations. Casablanca products represent the successful synergy of elegance, versatility, efficiency, endurance, and comfort. Our goal is guaranteed satisfaction in our long-term relationships with customers, which is why we offer the most comprehensive warranty and service programs in the industry.