Special aviation aluminum alloy, high strength, impact resistance, twist and pressure. Surface treatment:high-mesh sand blasting machine and color quality pure . Ultra-low chemical residues, attached to a solid! Font Handling:Font clear mission, silk screening of non-mimeo, attached to a solid! material:metal Using And Rings To Take Better Pictures What is a ring rings, also known as adaptor rings, allow you to filters and accessories are not the size as your cameras lens. Lenses and filters come in a range of types and sizes and unfortunately they 't always fit correctly. Fortunately there is a or filter for any need. How rings work rings a way to fit a larger diameter filter or accessory onto a smaller lens. The rings screws onto your lenses threading and provided a larger thread with with you can then attach other elements included more rings. How rings work rings work in the exact way but a way to attach smaller accessories and filters to larger lenses. size:49mm/1.93 inch, 52mm/2.05 inch ,55mm/2.17 inch ,58mm/2.28 inch, 62mm/2.44 inch , 67mm/ 2.64 inch 72mm/ 2.83 inch ,77mm/3.03 inch colour:as shown Package Included:1 x 49mm-52mm Step-up ring 1 x 52mm-55mm Step-up ring 1 x 55mm-58mm Step-up ring 1 x 58MM-62mm Step-up ring 1 x 62mm-67mm Step-up ring 1 x 67mm-72mm Step-up ring 1 x 72mm-77mm Step-up ring Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.