Because the material properties are suitable, weight, springiness, slick surfaces, strength etc.
Alpine snow skis are typically made of a combination of materials such as wood, fiberglass, metal, and plastic. The core of the ski is usually made of wood for stability and responsiveness, while layers of fiberglass and metal provide strength and durability. The top layer is often a plastic or composite material for protection and aesthetics.
Different Materials like metal and Fiber Glass
If��a��cup��is��plastic��then��it��is��not��made��out��of��metal.����It��is��made��out��of��plastic.����You��could��get��custom��cups��online��though.
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