Product Description:
These are typically designed to dispense salt and ground pepper, commonly used at dining tables or in kitchens for seasoning food. They often come in a set, with one shaker designated for salt and the other for pepper, distinguishable by their contents or sometimes by labeling or design variations. 

Material Description:
The shakers in the image appear to be constructed from: 
Stainless Steel:
The upper part of both shakers, including the cap and body, is made of stainless steel, providing a sleek and durable finish.
Glass:
The lower, transparent portion of the shakers, which holds the salt and pepper, is made of clear glass, allowing visibility of the contents and indicating when a refill is needed.