This is a large-sized box with three sides. Size: 11.5 x 19.7 x 4.3(H)cm *Measured by an amateur Black is suitable for medium to large-sized flies. White is suitable for small (including midge) to medium-sized flies. For more details, please refer to the C&F Design website, etc. It shows signs of use, but can still be used without any problems. The opening and closing are smooth and there are no issues. For the photos, a 5cm piece of cellophane tape was temporarily used on each.