This ice pack is used for certain types of ceramic hides that have a pace for an ice pack to help a hamster cool in warm summer days. We do not recommend using this in the enclosure out of the ceramic hides.
 
This ice pack fits well in the Bucastate Coconut Ceramic Hide as shown in picture.
 
These can also be used in the Bucatstate Castle Ceramic Hides, there is enough room in there for 2 of them at a time if you want have more.