Simplify the following text for a Grade 7 native English-speaking person.
Original: The term `` alloy '' is sometimes used in everyday speech as a synonym for a particular alloy . For example , automobile wheels made of an aluminium alloy are commonly referred to as simply `` alloy wheels '' , although in point of fact steels and most other metals in practical use are also alloys .
Simplified: An alloy has properties different from the metals it is made of .