Rubber stone, removes rust and burrs, Useful for all servicemen, Long lasting
Mjuk:
Every person should own one of these. Great for removing rust and burrs. Also works well for feathering back (detuning) the tips and tails.
Hård:
For polishing and light to medium edge clean up. Can be used after filing to remove micro burrs.
Extra hård:
Extra hard gummy. Used after filing to remove micro burrs. Makes the steel edges more durable.