X-acto #11 Knife Blades 5 Blades per Pack

Pros: Inexpensive, oval center allows blade to be easily locked in place.
Cons: Extremely sharp, spent blades need to be properly disposed of.

Ask any artist what they prefer to use for a cutting tool and you’ll get a variety of answers but I can almost guarantee that the X-Acto name will come up more often than not. For the most part the X-Acto products are inexpensive, easy to work with ...

Pros: none
Cons: Poorly made, burrs on tips and wore out quickly.

I work in a leather furniture/finishings shop and the blades we work with are required to make precision leather, parchment and shagreen cuts, however, our last batch of x-acto #11's were poorly made, with burrs on the tips and they wore out quickly.
We are trying other brands now (Excel).