Excellent plastic, not fragile. Flexibility also doesn't mean that it won't become brittle later. It has a long length that is required for the air pump to be in an open area so that the air does not heat up and get into the water and kill fish or aquatic plants. I figured I didn't need the length so I put it too close in a closed box. Not a good idea as my aquatic plants were dying. doo on me So I used a length that gave extra cool airflow, no more dead plants. I'm glad I didn't have a fish to kill. Also, the size is perfect for connecting hoses to fittings with no air or water leaks, easy to put on and then take off and then put back on after I decide to move. Every time I put it on, then took it off and put it back on. And again and again he stayed skintight. If only Lee would make a Bubble Wand because it's a really high quality 5 star rubber plastic (or any other plastic). I think I could use this material for auto pipes in a pinch. Haha lol really good quality.
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