steel and more steel
Spring steel.
gold leaf
Almost all of them are steel. Some trucks, late 80's early 90's have a thick fiberglass leaf spring in the back.
the eye of a leaf spring, assuming u mean the eye at end of spring, is used to bolt the spring to the vehicle
Suspension.
To keep the leaf spring in place and it doesnt fall a part
A chariot of Tutankhamun, the Egyptian Pharoah, had springs. It was make in Egypt in 1333 BC. The Romans used leaf springs in their carts. The first coiled spring was patented in Britain by R. Tradwell in 1763.
Palm leaf?
palm leaf
Illuminated manuscripts often used materials like gold leaf, silver leaf, and vibrant pigments made from minerals and plants to make the pages appear to glow. These materials were applied meticulously by skilled scribes and illuminators to create intricate designs and embellishments that captured light and gave the pages a radiant quality.
Dental materials are examples of materials that are used to make impressions.
who first used plants to make materials