It is a tube made of silicone which makes peeling garlic easier.
Garlic peelers are made of silicone and therefore come in just about every color of the rainbow.
These are great tools that make garlic peeling a breeze.
If you are peeling one clove or a hundred, this tool is your friend.
The Oxo garlic peeler featured on this page is a great example of what to look for. It is a full size tube, colorful and comes with a storage case.