The @Microtech ZBT (Zero Blade Play) is the ultimate in OTF technology. The recent upgrades include Microtech’s ultra-smooth Duel Fuel Drive Train double spring firing system, and the Crud Cutter under the thumb slide to break down pocket lint and other debris while reducing friction. Microtech’s biggest advancement yet is the Zero Stop blade system that completely eliminates any blade play. And all of this is done at an affordable price.