Pokemon Center Japan silicone molds
These are ice molds but I used tap water to make ice and they got hard water stains, hard to secure rid of. I tried using Isopropyl alc*h*l and It didn't work.I think they could be repurposed to use with resin. If you can safely remove the stains it could be used for ice or jello.I read you can use vinegar to remove the stains but I didn't try in fear of not working and leaving bad smell.Please only snag if you are okay with the hard water stains.