[High quality material]. Nickel-plated metal with a tough hard surface and a good seal, perfect for keeping loose items safely organized in books. [The distance between each ring is 16mm/0.63, the total length is 4cm/1.57inch, the diameter is 2cm/0.78inch, and the thickness is 2.5mm/0.01inch. [Easy to use]. The strapping ring is made of two parts, connected by a swivel rivet, very easy to use, just pull it out and press to close. [Available in silver and black Available in silver and black with smooth, shiny, simple and generous appearance. Perfect for paper decoration. [Wide Range of Applications] This flipchart is ideal for attaching documents, paper cards, badges, color coding, flipchart sheets. sheets, cards and other sample media, and is a very useful aid in offices, businesses and homes.