TINANA Clear Ice Ball Maker, 2.5” Clear Ice Cube Tray Make 1 Large Sphere Ice Balls, Crystal Clear Ice Cube Maker for Whiskey, Cocktails & Bourbon, Gifts for Men

Pretty clever design, the expansion of the freezing water in the lower chamber pushes the ice ball up and out. Be sure to empty it entirely and refill for the next ice ball so you get that expansion, otherwise it can be hard to remove the ball

On my second attempt the ice spheres turned out perfectly! Had to leave in the freezer over 24 hours to get them right 👍🏻

This one is definitely worth the price. Although the instructions are not very good. It's a blend of technique and art. It took multiple tries, and experimenting with five other molds I purchased before I got this one to work. Pictures #1 and #2 show the end result. I used filtered bottled water and boiled it, let it cool, then filled to the top. Allowed it to overflow, and poured out just a little. Then let it sit in the freezer for 36 hours. I also covered the top with a paper towel to prevent holes from freezing, which would block the air bubbles from escaping.Not boiling it, or taking it out sooner than 36 hours, produced pictures #3 and #4 with air bubbles trapped inside in a straight line trying to escape. Picture #5 shows if you take it out too early then it didn't completely form. Picture #6 shows white milky balls when using filtered water from the tap and ice trays where you push the molds togethers, but weren't insulated. The insulation in this product is essential to create a slow freeze that allows the air to be pushed out. Considering how it can be very expensive to get the perfect machine to just fill and go, this on from TIANA is the perfect home device. If you want simple and fast, then buy the expensive products, and I guarantee it still won't work if you don't follow this blend of technique and art. I purchased the 2-ball versus 4-balls because of my freezer space. Hope this info helps!

This thing is huge and takes up a lot of room. I don't understand the need for this apparatus. I bought smaller ones that work perfectly.