Material: SiliconeSize:: 18.2*12.7*4cm/7.17*5*1.57Color: BlackHOW TO USE IT:– 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 (Note: The excess water will escape through the 6 vent holes at the top of each ball)– When full, gently press down on the top of each mold to force out enough water to give a slight air gap