What are gremlin bells made out of?

Gremlin bells are typically made from metal, often brass or aluminum, and are designed to produce a ringing sound. They are often adorned with decorative elements, such as engravings or colorful attachments, to enhance their aesthetic appeal. The bell is usually attached to a sturdy strap or keychain for easy placement on a motorcycle or vehicle. The purpose of the bell is to ward off evil spirits, particularly in motorcycle culture.