Speedball is essentially a notebook

Laptop

A laptop, also called a notebook, is a personal computer for mobile use. A laptop integrates most of the typical components of a desktop computer, including a display, a keyboard, a pointing device and speakers into a single unit...

 accessory which allows for easier movement of the notebook on desks and reduces heat build up by creating a cooling gap under the notebook.

Speedball is a hemisphere

Sphere

A sphere is a perfectly round geometrical object in three-dimensional space, such as the shape of a round ball. Like a circle in two dimensions, a perfect sphere is completely symmetrical around its center, with all points on the surface lying the same distance r from the center point...

 attached under the notebook (by adhesives, velcro

Velcro

Velcro is the brand name of the first commercially marketed fabric hook-and-loop fastener, invented in 1948 by the Swiss electrical engineer George de Mestral...

or twisting) to elevate it, at the same time allowing the user to more easily adjust the notebook, protect it from indirect spillages and prevent shock when the notebook is moved around from place to place.

There are 3 versions in the speedball series, the Snapball, Postball and Twistball.