Depends on what kind of key.
Brass , is the most widely used metal for keys.
A reed, brass (or metal), and plastic for the keys.
Keys are made up of various sorts of metal.
An instrument that has 15 metal keys is called a nyunga nyunga. These 15 keys are arranged in 2 different rows and is a type of mbira instrument.
Metal
Typewriters are typically made of various materials including metal (such as steel and aluminum), plastic, rubber, and glass. The body of a typewriter is often made of metal for durability, while plastic parts are used for components like keys and covers. Rubber is used for the platen and other parts that need to provide friction or cushioning. Glass may be used for the keys or typebars.
Manipulative keys are special keys used to manipulate data in the document.
a regular flute has covered metal keys, and some have metal keys with holes in them. indian flutes are made of bamboo and have no keys, only holes
Many percussion keyboards have metal keys. Some of them are glockenspiel, xylophone and vibraphones. Piano is not a percussion keyboard as it has a string mechanism as well.
Yes, Europeans used keys, particularly from the Middle Ages onward. Keys were primarily made of metal and were used to secure doors, chests, and other valuables. The design of keys evolved over time, with more intricate and specialized types emerging during the Renaissance. They played a significant role in home security and the protection of personal belongings.
In theory, yes. In reality it depends on the distance between detector and keys. You'd pprobably need to get within a foot or so vertical distance between detector head and keys to get a signal.
The xylophone has metal keys that you strike with a wooden hammer.