Here's why lead is popular:

* High Density: Lead is incredibly dense, which means it's heavy for its size, making it effective for sinking fishing lines quickly.

* Malleability: It's easy to shape and mold, making it versatile for creating different sinker designs.

* Cost-effective: Lead is relatively inexpensive compared to other dense metals.

However, lead can be harmful to the environment and wildlife, leading to concerns about its use. Here are some alternative metals used for fishing sinkers:

* Tin: Tin is softer than lead but still provides good weight.

* Steel: Steel is more durable and environmentally friendly than lead but can be more expensive.

* Tungsten: Tungsten is even denser than lead, making it perfect for smaller, ultra-heavy sinkers, but it's also the most expensive option.

The choice of metal for fishing sinkers depends on the specific needs of the angler, considering factors like the type of fishing, the target species, and personal preferences regarding environmental impact.