Tried putting it on a smooth clean glass window a few times but it didn't last long, I didn't want to risk it falling off one of my 12lb crampons or jumping on it also. I've seen them break bolted shelves off the wall so I'll guess them unless they're industrial electromagnetic (like the ones in the cartoons). Moistening or soaking the suction cups (as instructed in the instruction manual) did not bring the best results. The problem wasn't its strength, but its duration. I even tried them on a sliding glass door, a plexiglass window, a wall mirror, etc., closet door mirrors. He fell down every time. So I'm going to turn it into a regular shelf and just screw it to the wall. The same concept but without the view or the sun. You seem to like curved shelves. I don't know why they are so expensive. I think the other problem is that all the badly photoshopped "cats" in the pictures are usually kittens or those miniature cats that are so trendy right now like the Singaporea, Burmese and Munchkin not usually 4 lbs in the US Mine are abandoned street cats I got them from a shelter They weigh 5.5 kg (12 lbs) Months and I love them There is nothing they wouldn't jump on unless , it has already been dropped once The Suckers It just seems like a sloppy design I can't give this one star because then I think that should have worked but given its simple design I don't see a simple answer. There might be a crack or a hole in there, but I didn't find such an anomaly. These rather large suction cups give me no sense of security and I don't risk my cats falling over. Suction cups are more for balance or reinforcement. Or just fun for people who want to climb the wall. Does not support the entire object. I just can't trust them.
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