silicone, flexible Unlike the tray, silicone ice mold is flexible, simply twist the silicone tray Suitable for, cocktails, ice coffee, juices or babies food for baking lover or use: Press firmly, secure the clear lid, open the silicone cover, add water to the water, cover and refrigerate for over 8 hours Remove the hockey balls and allow to stand at room temperature for 1-2 minutes before Temperature tolerance from 40℉ to +446℉ ( 40℃ to +230℃) Oven, microwave, dishwasher and freezer safe