Plastic suction cups are versatile devices commonly used for creating temporary attachment to smooth surfaces. They are typically made of durable plastic materials, often PVC or ABS, and feature a concave shape with a flexible rim. This design allows them to create a vacuum seal when pressed firmly against a smooth, non-porous surface, such as glass, tile, or metal.

The main body of the plastic suction cup is hollow, allowing air to be expelled when pressed against a surface. This expulsion of air creates a vacuum between the cup and the surface, generating suction force that holds the cup in place. Many plastic suction cups also come with a small tab or lever on the rim, which, when pulled, releases the vacuum and allows for easy removal.

Overall, plastic suction cups provide a simple and effective solution for temporary attachment to smooth surfaces, offering convenience and versatility in a wide range of applications.