Ten blades are within and they are made from a thin metal.
The most important thing is to find a handle which can grip the thin blade. You can also cheat and superglue a piece of PE brass to the section to be inserted into the blade handle to ensure a tight grip. Here, I am using Excel's Fit Grip handle.
The long straight side (not the angled one) is the sharp edge. It does bend easily and returns to its straight original attitude.
Here, I am using it to shave off the raised pin mark on Mr. Leach's F-15C front fuselage interior.
More tests to be added to try the sharpness and durability as well as the point where it kinks or breaks.
Well into 4 weeks and finally the bend is noticeable and the blade is a bit duller in spots along the cutting edge (remember, there are ten blades so I still have nine replacements left):
Click on "More Information" on the right column to visit their website to learn more or order directly from Flash Master Hobby. The ten pack is only $9.90USD plus shipping. PayPal accepted.
Saúl García, II