These fly boxes feature flat foam on one side and compartments on the other side with spring loaded hinged doors. They also feature aeration holes in each compartment to enable your flies to dry out.
Available in 2 sizes
Small (3.5x2.5in) - 6 compartments (1.25x1.25in each)
Large - (6x3.5in) - 8 compartments (aprox. 1.75x1.5in each)