Ref.1281-Ref.3467
Those juggling balls come in different weights for different strength's or goals.
Press on the pink button and replace the contents by any other (water, sand, etc.) to modify the juggling speed.
Indicate by preference your choice of colors in comments at order's validation
Ref.2584
Phospho
Big balls to juggle even at night...these are glow-in-the-dark which will glow for a few minutes after being charged by exposing to light !