Specialized zoom ring adapter designed for Nikon lenses when used with Isotta underwater housing systems. Only printed parts, hardware NOT included. Made out of pla plus I can also make out of other materials if asked like Petg, Abs, Nylon just message me and ill let you know the cost Shipped out the next day! If you like another color let me know its default is Gray so message me so i can make the color you like before you purchase Gray Blue White Black Pink Orange Brown Purple Red Silver Yellow Copper Color Marble Army Green Wood Color Bone White