The process of multi-shot molding (also referred to as 2-K Molding) utilizes the injection of different materials into different locations on the 

same mold. In multi-shot molding, at least two shots (hence the 2-shot or Two-Shot Molding labels) are injected into the mold vs. a single 

injection native to traditional injection molding techniques.

Interestingly, in multi-shot molding, the mold may be moved, rotated or changed in some other way between the multi-shot injections to the 

mold. 

A few of the benefits of the stack molding process include: 
Cost effective due to the elimination of a process
Improved craftsmanship (Clean and smooth transition of material)
Improved durability over two piece designs