This set of silicone ice ball moulds are the perfect addition to any kitchen! Ice spheres melt slower than traditional ice, allowing you to enjoy your drinks for longer without having to worry about them watering down. Class up your beverages when having guests over, add fruit before you freeze for the kids! Made from 100% BPA free silicone, flexible for easy release, non-toxic, and easy to clean and dishwasher safe. Each mould measures 4.5 inches x 4.5 inches. INSTRUCTIONS: Before using your new tray, be sure to wash to wash thoroughly with soap and water Fill the bottom tray nearly full of water (leave about 1 cm unfilled) Then set the bottom tray on an even surface in your sink and press the lid tray down into the bottom tray until it is sealed When full, gently press down on the top of each mould to force out water to give a slight air gap at the top of each ball for expansion - This step is important so your ice balls will form properly without cracking - Need to leave room for expansion Lay flat in freezer for 5+ hours Before removing mould lid, break all ice around balls using a twisting motion...with lid still on After using this step to break ice, remove top lid and release ice spheres from bottom tray Ice balls are now ready for removal! 2 PREMIUM ICE moulds - Each mould measures 4.5 inches x 4.5 inches and makes four ice balls. Each ice ball is approximately 2 inches.