Please do not send curved nippers as they rarely respond well to sharpening:
Nippers are delicate tools, as such their edge has little room for repair. Any previous attempts to sharpen the nippers on anything other than the correct machinery may render the nipper unsharpenable.
There are a lot of inferior quality nippers that also make our job difficult.
When there is damage we will do what we can to bring back a sharp edge, if the damage is significant then it may be that they are beyond repair.
Results are mixed, if you are not happy please tell us and we will refund the cost of the sharpening, or if they fail our quality checks we will automatically issue a refund for the sharpening.