This is by far the worst zipper I have ever used. 20% of them broke under their own weight when trying to pull them off. Another 30% burst with every voltage. Only about 50% actually worked as intended, which for the price wouldn't sound bad until you factor in the disappointment. I wouldn't recommend them highly to anyone. Spend a few bucks more and get quality. As a note. I decided to actually test the pair's strength after they broke when there was no load. I used a 10lb zip lock locked in one of these. I pulled on both to see which one broke first. This was the case in 80% of the cases. (There are a few good quality ones in the package.) Out of 10 tries, 8 broke at 50lbs, not 2 of the 10lb zip ties. This tells me that the company has low quality assurance standards, with entire batches of partial batches entering the commercial stream when they should be rejected. Even the teeth on the ties are not the same across multiple ties, which should be a clear sign that something is wrong with this production batch. I personally will never buy this brand again, no matter how cheap they are.
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