Size: Diameter: 37 x 17mm / 1.46 x 0.67 inch (Outer*Inner); Total Height: 11mm / 0.43 inch Advantage: Made of durable EVA foam, lightweight and fast drying, easy to carry. Designed with large diameter for storing more and longer fishing line. Good organizer for fishing line and not easy to crack even bending. Come with a storage box which can help you store the spools for easier access. Instruction: Easy to use. Just applied the fishing lines on the spool to keep them tidy. Application: The fishing line spool is good for holding all sorts of fishing lines, hooks and leads, keeping your fishing gear clean and tidy, and great for use on fishing activities like fly fishing, boat fishing etc. Notice: Please read the measurements before ordering if you are concerned about the size.