Foam is a wonderful material to tie flies with, float excellent and is available in a variety of colours.
Cutting foam into thin and precise strips, on the other hand, is a challenge, which is why this foam cutter was developed.
With this plate / clamp and a razor blade, you can easily cut strips of your foam sheets in widths from 1-10mm and with a maximum length of 120mm and a thickness upwards of 6mm.