Material:Silicone

Description:
For Most drinks - This big head melt slowly and keep your drink cool, best for cocktails and whisky.
It can also use for iced tea, coffee, soda drink, fresh juice, fruit punch and even iced water
It is great for halloween christmas, summer pool parties, restuarants and bars
 It is non toxic, BPA Free. Safe to use in refrigerator, dishwasher

Before Use:
You are recommended to wash it before use, or some suggest to put it into oven for 3-5 minute if there is strong silicone smell.
Step.1 Close the tray and try to lock the groove on the side of each skull
Step.2 Fill in the skull with water from the top hole, sure you can make fruit jello or chocolate skull too
Step.3 Put into fridge for about 6 hours

Extra Tips for Clear Ice Skull:
As mentioned, pure water is one of the factor. Another key factor is you need to control how it cools.
Try to chilling the water more slowly, you will more higher chance having clear ice skull.
You can put it in refrigerator at lower temperature for hours and put to freezer for another 4-6 hours
Practise make perfect