These 3 set ice cube trays are made of PP and Silicone material. Each tray makes 6 nice-sized cubes for a total of 18. Tray size 11.5*4.0*7.0cm The material on the bottom of the ice cube trays is made of soft silica gel, which is designed for quickly releasing the ice. No need for bending or twisting the trays so hard. Each tray comes with a removable lid. This smart tool is very convenient to make full shape cubes while preventing spills and the freezing of excess water and keeps ice cubes from absorbing freezer odors. Moreover, these easy-release trays stack easily and neatly in the freezer without a massIt can be washed by a dishwaher. Fill the trays with water, cover the lid on, and then slip the trays into the freezer. Besides, you can also fill the ice cube mold with fruits, ice cream, soda and wine to customize your favorite flavor. Warm Tip, Please Don't twist the tray that hard, just gently is enough.