The Blackie Collins "letter opener" features all Glass filled polymer construction, beryllium copper springs and sharpens to razor sharp on your favorite sharpening device with just a few strokes. This amazing concept knife has no magnetic parts (signature.) Push the thumb stud and the blade snaps out into the locked position (7.25" open length) with the patented assisted opening mechanism. To close the blade push in the button and the 3" blade folds into the handle. Total weight is 2 ounces.