Because the material properties are suitable, weight, springiness, slick surfaces, strength etc.
Wood and fiberglass are the most common for the core but you can also have carbon fiber, the edges are made of metal, modern day skis are carbon steel but older skis can have chrome type, such as those used in cutlery. Thetopsheet, graphics and bases are made out of various kinds of plastics.
Different Materials like metal and Fiber Glass
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They where made out of Metal and plastic the Plastic is called zlonite.
plastic and metal :|
The lenses are made from either glass or plastic. The frames are generally made from plastic, nylon, a metal or metal alloy.
mainly metal and plastic (plastic cover metal inside)
They are made of both metal and plastic
it is made out of plastic and the rod to the brain is metal/plastic
metal and plastic
plastic and metal
Plastic