It's a decorative, usually circular molding installed on a ceiling to surround a lighting fixtures, enhancing room elegance. They act like focal joints that add architectural interest, hides in electrical box gaps and bridge classic or modern styles. It's also used as a decorative base to elevate chandeliers and lighting fixtures, creating a balanced, cone like visual effect. Add architectural detail to plain ceiling, often paired with crown molding for luxurious look. Very easy to install, lightweight and durable. Imported and at reduced cost.