Attn: Christina Montero It can be verified very clearly by a very close inspection of these 6 sifus that they have not been abused. I have only abused one sifu which is my everyday cary knife and it has stood up to all the test I have applied to it. These 6 sifus have only been modertly spine whacked and they fail the spine whack test now when very lightly spine whaked. Tell me where to send these for repair. I am the customer who spent $1200 and got 8 sifus 6 of which are in dangerous condition of which I believe to be due to the lack of quality control.