X-Acto blades are of great quality. The #11 is of no exception. It is a thin extremely sharp blade that is small enough to be capable of fitting into very small spaces. One can even cut straight down into models when one could not otherwise slice sideways. This set comes with 100 blades, which would be a great deal if they were not so expensive. These blades last for a long time, so I would just stick with buying a smaller pack. However, if one is constantly breaking his blades, this would save quite a few trips to the store.