Washers are the main currency in Metal Arms: Glitch in the System. They are literally just like washers in the real world, they can be used to purchase weapons, health, and ammo at Shady and Mr. Pockets' shop. Silver washers are worth one washer and can be found by destroying Mils and other destructible objects throughout the levels. There are "oily" washers worth anywhere between 10-50 washers which appear as a bright red shaded washer.