Solid plastic balls, which are commonly made from materials such as thermoplastic resin and polystyrene, possess exceptional durability and strength, making them ideal for use in packaging that requires high-level protection for its contents. This makes them a great option for use in ball bottles, where the contents can be easily rolled and dispensed, thanks to the spheres' smooth and seamless surface.

On the other hand, Polypropylene (PP) balls are lightweight and provide excellent heat resistance, meaning they can withstand high temperatures without deforming, making them an ideal choice for packaging materials that need to be sterilized.PP balls are also perfect for use in small ball containers that require multiple spheres inside - their lightness and small size allow them to be stacked and easily dispensed through the container's narrow opening.

In addition to their functional benefits, the use of these plastic spheres in packaging materials like ball bottles is also beneficial due to their recyclability and cost-effectiveness. Both solid plastic and PP balls are highly recyclable and can be easily processed and repurposed, making them more environmentally-friendly than other packaging materials.

In conclusion, plastic spheres such as solid balls and PP balls can be used in ball bottles and other packaging materials to provide excellent functionality and protection, as well as cost-effectiveness and eco-friendliness. Their various qualities make them a popular choice for companies looking to package their products with quality and efficiency.