TRM (Three Rivers Manufacturing) Shadow black G10 w/20CV bladeTRM Shadow Black G 10 scales w 20cv blade Consistent with many of TRMs models, the Shadow features a . 090 thick CPM 20CV powdered metal steel blade for its renowned corrosion resistance and edge retention. Of course, the 3. 2 blade edge is razor sharp right out of the box. TRM tries to add a special detail for every model. Besides introducing the River Lok, we have decided to machine removable tabs to fill the space milled on both sides for the deep