Here is a selection of 3 different Sonic themed balls. They aren't really sports balls, but likely all fall into the 'hi-bounce' category. The first, at left is a SA1 era "Superball" type. It's made of primarily clear tough rubber that has a flat disk embedded in the center. One side has Sonic & the logo, the other just the logo with Sega copyright.

A clear ball like this must not be bounced.
Proper care includes NOT bouncing it because scuffs to the surface reduce the clarity of the rubber which can't be fixed. (It will become opaque/can't see the design. Taking care to not bounce the ball is difficult, but necisary for collecting.

The "Sonic Face Bouncy Balls"...are these the same ball, just in different packaging? The left side ball is a "Collector's Edition" in a square box for stacking on store shelves. It says "With Super Sonic Bounce!" The right side is in a off-rectangle clamshell package for hanging on store pegs. It has the same slogan, but says in the red shape "Composed of Compressed Rubber For Super High Bounce!" Nothing indicates the sizes of any of them. Where are these sold?