Overbed tables are typically made of lightweight, sturdy, and durable materials that can support the weight of objects on the table and be easily cleaned. Here are some common materials that overbed tables are made of: 

1. Plastic: Overbed tables made of plastic are lightweight, easy to clean, and can be inexpensive. They are typically made of high-density polyethylene and have a smooth surface that is easy to wipe down. 

1. Metal: Overbed tables made of metal are typically made of lightweight metals such as aluminum or steel, which provide durability and strength. They can be adjusted to different heights and may have features such as locking wheels or adjustable tabletops. 

1. Wood: Overbed tables made of wood are less common but can provide a more aesthetically pleasing look. They are typically made of lightweight, durable wood such as bamboo or beechwood, and can have features such as adjustable height or tilting table tops. 

1. Composite materials: Some overbed tables are made of composite materials such as MDF (medium-density fiberboard), which is a type of engineered wood. These materials are durable, lightweight, and easy to clean, and can provide a more aesthetically pleasing look than plastic tables. 

The specific materials used in an overbed table can vary depending on the manufacturer and model. It is important to choose an overbed table that is made of high-quality and durable materials to ensure that it can support the weight of objects on the table and provide a stable surface for the patient to use. It is also important to ensure that the overbed table is installed correctly and used safely and appropriately by the patient.