Review on Wanhork 25-PC Silicone Aquarium Airline Suction Cup for 3/16" Fish Tank Airline Tubing, Connectors, and Check Valves - Professional and Thickened (Black) by Misty Mcclellan

I love these and I'm glad I ordered them. Use it to organize tubes for my fish tank so it doesn't hurt my eyes. I have a Fluval Flex and the back of the filter box is plastic. Suction is generally weak, but they do a great job with air hoses. I only had to press it a few times to make sure it was flat and the air was removed from the center. Suctioning the glass under water is not a problem. I took them out during maintenance to rinse them before sticking them back on the glass. It's definitely durable and reliable for my needs. Also thick fabric. Has a strong plastic U-hook for gripping the air hose. Comes with other accessories as listed but I don't need them yet.