My girlfriend sent me this picture from the directions to her round ice cube tray. Whatever 300 water is it's not milliliters because they aren't that big. : r/engrish
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LUDOU Ice Ball Mold, Big Round Ice Cube Tray for Whiskey Cocktail Drinks, Large Silicone Reusable Ice Sphere Maker Set (4 Big Ball Capacity) : Amazon.co.uk: Home & Kitchen
Large Ice Cube Tray Ball Maker Big Silicone Mold Sphere Whiskey Round Mould DIY | eBay
Ice Ball Mold - Etsy UK
Silicone Ice Cube Trays -Ice Ball Maker Mold with Lid - Big Ice Cubes for Whiskey, Cocktails & Bourbon - Sphere Ice Mold Ball Maker(Light Blue Round) : Amazon.co.uk: Home & Kitchen