1888a123_Beginner_Dirt_Bike___GICL_Wiki_Dirt_Bike_Parts_List_Function
[Part and Quantity] Rear Shock (1) [Part Number] DR70-116 [Materials] Metal spring; probably steel for strength and resistance. This is coated in rubber housing. [Forces] Forces applied would depend on the weight of the rider and the motion of the bike [Manufacturing Process] Metal is twisted in a spiral to create spring. Spring is then coated in rubber to protect it. Ends are milled and drilled to create space to for attachment [Shape] Shape is defined by the requirements of the shock. A shock designed to absorb 100 lb of force compared to 200 lb of force would be very different, in size and thickness of spring [Part Complexity] 4 [Function] 
Functional: absorbs forces caused by movement over uneven terrain
Group 11 - Beginner Dirt Bike - GICL Wiki