Our Premade 12D Loose Fans 0.5 (500 Fans) are a pre-made set of individual eyelash extensions designed for professional lash artists. The '12D' is each fan contains 12 lashes, providing a voluminous and dramatic look to the lashes. The '0.5' likely refers to the thickness of the individual lashes, with 0.5mm being a common diameter size used for eyelash extensions. These premade fans are crafted in a fan-like shape, making them quicker and easier to apply during the lash extension process, ultimately providing a full and fluttery appearance. There are 500pcs in each container.