The suction cups themselves are quite good, but there are a lot of defects among them (they work, but they are covered with dots). BUT! I contacted the seller expecting a 50% refund, because about half of the suction cups were defective. Aliexpress ruled not in my favor, offering to send the parcel back (not cost-effective). But the seller understood my situation and returned 100% of my money. This is a very good service.
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