Creatures Features Set In Glass Riddle

Riddle: We are little creatures; all of us have different features. One of us in glass is set; one of us you'll find in jet. Another you may see in tin, and the fourth is boxed within. If the fifth you should pursue, it can never fly from you. What are we?

Answer: We are vowels.

Source: https://www.riddles.com/32

We are little creatures; all of us have different features. One of us in glass is set; one of us you'll find in jet. Another you may see in tin, and the fourth is boxed within. If the fifth you should pursue, it can never fly from you. What are we? — Creatures Features Set In Glass Riddle by Anonymous v1.

Riddle: We are little creatures; all of us have different features. One of us in glass is set; one of us you'll find in jet. Another you may see in tin, and the fourth is boxed within. If the fifth you should pursue, it can never fly from you. What are we? Answer: We are vowels. — by Anonymous v2.