There are three types of leaf springs.
Multi-Leaf Springs
Multi-leaf springs are made up from heat treated strips of SAE 5160 Steel, in diminishing lengths, formed to a predetermined arch and held together by a bolt to the center.
Mono-Leaf Springs
Mono-leaf springs are a single heat treated plate of steel whose thickness is uniformly tapered from the center towards each end.
Parabolic Springs
Parabolic Springs are multiple mono leaf springs that consist of two or more tapered leaves.