The latest installment of knives from the Boys at Ferrum Forge Knifeworks comes by way of a collaboration with Arena Knives called the Tredecim (Latin for the number 13). It features a harpoon style N690 blade with killeråÊaction that flips via ceramic bearings. The handle is full anodized titanium scales and milled pocket clip with hidden screws for a nice clean look.åÊGreen anodized hardware, pocket clip and spacers make this thing pop! Ferrum Forge Hard Case included.