1. All SILICONE MATERIAL - This ice cube trays is made of silicone, no any plastic material included, you can rest on assured to use it every day 2. NO LEAKING AND STACKABLE LID - The special designed lid can be sealed firmly after filling the water in, it can prevents the leakage perfectly and keep the contents inside from absorbing zer odors. Besides that, this small ice cube trays can stack easily and neatly in the zer to save space without sticking 3. EASY TO POP OUT AND NON-STICK - Made of rigid but flexible silicone, the bottom of this ice cube mold is shaped well. Each flat cube compartment is separated from each other, then you can easily push from the bottom to pop out the ice cubes without any residue 4. JUST THE RIGHT SIZE - Each ice cube is sized in 1.18 inch, not too large nor too small, you can use it ly in your cocktail or Bourbon without worrying diluting, ze some ground coffee or tea cubes to get a fast cold brew. Moreover, they are also great for storing extra frozen herbs & food or makes some mini cakes in the oven