These balls are truly silent but usless as ping pong balls as they do not bounce .I am at a loss as to why decathalon stock them or continue to sell them.They must have never tested them but agreed to a large amount.
Response of the brand
Thanks a lot for your feedback on the balls PPB 100 Silent.
This ball is designed first for users who want to play silently indoor (in an appartment or in an office) for enjoying, learning ping ping and starting soft challenges, mainly without spin.
We know, thanks to our tests with users, that the performances in terms of rebond, spin and speed are quite different than an academic ball, so I can understand your unsatisfaction in case you were looking for these advantages.
I advise you to return your product to your Decathlon store to exchange or have you pay back.