The Filter Holder A Series by Cokin is a versatile accessory in the Cokin filter system that allows photographers to easily mount square filters in front of their lenses. This product is designed to accommodate filters of varying sizes and densities, making it ideal for creative effects such as polarizing, graduated, and neutral density filters. The Filter Holder A Series is manufactured by Cokin, a trusted brand known for producing high-quality photography equipment. With its durable construction and user-friendly design, this filter holder is a must-have for photographers looking to enhance their images with professional-grade filters.