Micro Slit Foam is a concept by C&F Design for improved fly storage. Rows of foam with our patented design hold a wide range of hooks gently but securely. Notches help locate the Micro Slits, making fly organization a breeze. Just insert the hook bend into the slit as illustrated. 10 Micro Slit Foam rows on each side Designed for flies from #4 to #10 Notches help locate Micro Slits Slots for 175 flies MEASUREMENT: L 197mm W 114mm H 42mm COLOR: Black