The Cold Steel Leatherneck S/F Trainer is one of the best knives available for this purpose till date. It has a black heavy leather finger grip which makes the fingers hold onto the knife comfortably and manoeuvre it with ease. Also, the long steel grey blade which is perfectly sharpened for training fits beautifully on the knife. It comes at a minimal cost of around nine dollars and is recommended to be one of the best knives. Thus, in case you require a knife for your S/F training do not forget to consider the Cold Steel Leatherneck S/F Trainer.