This set includes 24 silver metal curtain rings and 24 white plastic curtain hooks. The rings have an outside diameter of 37 mm and an inside diameter of 30 mm, suitable for curtain rods less than 29 mm. The plastic hooks measure approximately 2.8 cm in length and 1.2 cm in width. The curtain rings are constructed from sturdy metal with a polished surface. To install, slide the rings onto the curtain rod, then attach the plastic hooks through the curtain threads and the eyes of the rings.