Defective Chinese blades. Keep in mind that they cut quite deep - I use them at around 39g pressure, whereas in the past (with a well known brand, quality blades) I've worked at around 120g pressure. The life of the control blade is ridiculously short - Approximately 10% of the lifespan of high quality branded blades. I have a vinyl graphics business and used to be able to go a month (maybe longer) without changing blades, now I change them weekly if I'm lucky. They got my money once - never again.
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