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They worked really well, the suction on them is awesome. Holds what needs to be held in place quite nice. They are very easy tu put on and off. Nice quality and durable.

Seem to be working well on my old Ebo-Jager heater

They are suction cups…they have a cup and they suction to a surface. ;). Work just fine, I bought them a tad too small but I made them work

Needed to find replacement suction cups for my Eheim heater as the ones they provide do nothing but deform and collapse inward almost immediately and won't keep the heater in place. These cups stay pliable and stick to the glass well. Only issue is that the cups fit too loosely in the plastic holders so you have to be careful putting them in place on the glass. The cups fit a 1" diameter heater pretty well, but wish they were a little deeper. The piece that locks the cup onto the holder takes a little of the space the heater normally would occupy, but it's just enough to hold.

Best suction cups I've found so far. These stick and stay. In fact they stay so well they are harder to take off than most. They are made of a high quality rubber that is thick and maintains the shape even after being stuck for a while. These are not like other suction cups that go flat after a few days and once removed can't be reused.

Very heavy duty

These fit perfectly. They were a good price too.

These are a great replacement for the suction cups on my aquarium heaters and other things that needs these. It's a bit big and its good quality from what I can tell.