Suited for regular size flies for trout.
Sufficient storage capacity than looks, avoid crushing hackle tied vertically.
Simple design with consistent 24 slits per row is capable to hold same fly in different sizes in one row ich as 6 pieces in 4 sizes in one row.
Easy to grasp flies used for refill after return from the fields.

5mm thickness (0.2inch)
Large-24slits 8rows (192-flies)
Medium-24slits 6rows (144-flies)
Small-24slits 5rows (120-flies)