These are replacement #11 blades for the standard hobby modeling knives. These work in the standard (RMXR6901) and deluxe (RMXR6909) knives. May also be used on any knife handle that uses a #11 blade.
100 #11 hobby blades
Hobby blades are extremely sharp. Use with caution and wear safety goggles. Do not bend the blade as it can break and cause injury.