The new generation of fly boxes is here. Foam has and will always be a good way to store your flies but silicone is a relatively new alternative that does offer some advantages. If foam is punctured with a hook it can rip easily and be permanently damaged. With silicone hooks come and go without ever leaving a trace which translates into an extremely durable and longer lasting fly box for your investment. It is 100% waterproof and will float if dropped into the water. The slimline fly boxes are perfect for small nymphs and midges. The clear lid also allows you to easily grab the fly you need during that critical moment on the water. This rugged fly box has a sturdy metal hinge pin and measures 7.25" x 4" x .6".