The top and bottom drawers are.
The top is deep, maybe 3-4 inches and the bottom 2 drawers are about 2 inches.
I can measure them it you’d like?
They are felt lined on the bottoms, the top lined on bottom and sides, just like a Gerstner. Don’t know what the felt is, but I have stored tools in mine for a few years without a problem.
Gerstner’s used a wool felt, specifically so they would not create a reaction/off gassing on steel, but don’t know if it is/was really needed.