Ball in Ball

4" ball inside 18" ball Ball in Ball - Extra Heavy Duty (0.438 wall) (Solid / Speckled) -

4" ball inside 18" ball Ball in Ball - Extra Heavy Duty (0.438 wall) (Stone) -

4" ball inside 18" ball Ball in Ball - Heavy Duty (0.375 wall) (Solid / Speckled) -

4" ball inside 18" ball Ball in Ball - Heavy Duty (0.375 wall) (Stone) -

4" ball inside 18" ball Ball in Ball - Light Duty (0.188 wall) (Solid / Speckled) -

4" ball inside 18" ball Ball in Ball - Light Duty (0.188 wall) (Stone) -

4" ball inside 18" ball Ball in Ball - Medium Duty (0.250 wall) (Solid / Speckled) -

4" ball inside 18" ball Ball in Ball - Medium Duty (0.250 wall) (Stone) -

4" ball inside 18" ball Ball in Ball - Severe Heavy Duty (0.520 wall) (Solid / Speckled) -

4" ball inside 18" ball Ball in Ball - Severe Heavy Duty (0.520 wall) (Stone) -

Photo Credits

Elephant Nature Park in Chiang Mai, Thailand, by Jodi Thomas
Pittsburgh Zoo & PPG Aquarium
Big Cat Rescue in Tampa, Florida