Since I'm assuming it is food grade plastic, it should be fine. I just got a Ball fermenting kit last week that works on the same principle, just inside mason jars. The kit I got was like this, but smaller, with just 2 lids and 2 springs to use on your own jars. I've been assuming it was inspired by tsukemono :)
https://www.amazon.com/Ball-Fermentation-Kits-32oz-Clear/dp/B084CYV2JD
Mine is actually a ball fermenting kit! Exact one like this
https://www.amazon.com/Ball-Fermentation-Kits-32oz-Clear/dp/B084CYV2JD