- Food grade material: The ice cubes tray is made of silicone material:durable and soft. Food grade, BPA free, nontoxic, odourless, no harmful substances.- Easy Ice Release: You just fill the trays with water and then slip the trays into the freezer.when the soft gel ice tray is placed in the freezer for a period of time, take it out and cover the cover and press it, one second quick ice.And the removable lids are perfect, for keeping the ice cubes from absorbing other food flavors in the freezer and to stack without spilling or sticking toget