This is the trainer for the MDV Folder. The trainer comes in both: Titanium body / Aluminum Blade or D2 Steel body / Aluminum Blade The reason you would spend the extra on the TI body is if you were really concerned with the weight difference when training. The contract called for TI trainers so its unknown if we will run more of these. These were part of a special over run of contracted blade so these do not have our logo on them. See specs on the MDV Folder webpage.. the TI and Steel body both look the same and are blue body and Red blade. The only difference is the weight. You may need to adjust the pivot pin on these as the blade is light.. some adjustment necessary