These are not robust cable ties. I define heavy-duty cable ties as gradually expanding and thick cable ties that are difficult to cut and therefore likely to last forever and a day. These are what I would call light wire ties. They work, it's just not something I would buy if I saw them in person. You could say it's discounts or value, or should I say "cheap" cable ties, but I've had no problems with them, they close nice and tight and they work.
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