Blue ping pong balls are commonly used for various purposes like beer pong, carnival games, arts and crafts, party decorations, and even cat toys. These ping pong balls have specific features and uses:

1. Quantity: The description mentions that there are 144 ping pong balls available.

2. Color: The ping pong balls are blue in color.

3. Size: The size of the ping pong balls is 40mm, which is a standard size for ping pong balls.

4. Material: These balls are made of lightweight plastic.

5. Versatile Use:

   • Beer Pong: The balls are commonly used in beer pong, a drinking game where players throw the balls into cups of beer placed on a table.
   • Carnival Games: These balls can be used in various carnival games where tossing or aiming is required.
   • Arts and Crafts: The ping pong balls can be incorporated into arts and crafts projects for creative purposes.
   • Party Decorations: They can also be used as decorations for parties, events, or gatherings.
   • Cat Toys: The balls can serve as toys for cats, providing entertainment and engagement.

6. Diameter: The diameter of the ping pong balls is approximately 40mm, which is equivalent to about 1.5748 inches.

7. Hollow Design: The balls are described as hollow, which is a common feature of ping pong balls, allowing them to be lightweight and easily throwable.

8. Entertainment: These balls are designed to be easily thrown and bounced, making them suitable for various entertainment purposes.

In summary, these blue plastic ping pong balls are versatile and can be used for a variety of activities, ranging from party games to creative projects. They are known for their lightweight, bouncy nature and are commonly associated with beer pong and other tossing games.