Two color ball- Where to buy ?

I bought a pack of joola spin two coloured balls from an Amazon seller earlier this year for our group. They are not competition standard, but have a specific use helping absolute novices to understand the spin they and their opponent have imparted on the ball.
They fly and bounce similarly to a proper ball, but they are different enough that any even semi serious player probably should be avoiding playing with them.

KPen said:

i do not know how true this rumor is but I heard ITTF is considerig such balls including soccer & volleyball type coloring , so players can read spin easier at al levels which is also good for presentation as with replays for TV audience.

Click to expand...

i bought a packet of white orange balls from an aliexpress dealer.
They are not ITTF aproved
The rules say that the balls can be white or orange but it does not say they can be half/half.

Honestly I could not see the spin all that well so I painted a few of them into
half orange/half black.....................now I can see the spin 😁