Lightweight, portable, and strong aluminum construction. Durable and easy to use. Perfect for camping, hiking, picnics, and sunshades. Suitable for 5mm ropes. Material: Aluminum alloy This is a set of 17 pieces. The 7 pieces in the 5th photo have been used once and are included as a service. There may be some scratches as they were stored with camping gear. Thank you for your understanding. Aluminum rope adjusters, rope stoppers, guy line liners, rope length adjusters, rope hooks