Spyderco Endura4 Trainer Trainers or drones are non-sharpened knives that allow for the safe practice of Martial Blade Craft (MBC). They let the user learn deployment/retrieval techniques, perform drills, and develop confidence and muscle memory without risking cutting themselves or others with a sharp blade. The Endura Trainer is identical in weight and size to the 'live' model. To enhance the balance of the piece we've tapered the unsharpened tip and drilled holes through the blade, removing unnecessary bulk.Volcano grip texturing on both sides of the handle put the brakes on your hand slipping while training. All Spyderco training models have red handles designating them as non-sharpened. Tip-up carry. *Endura trainers also fit the bill as a unsharpened practice knife to safely teach non-knife people the fundamental movements in safely opening and closing a folder.