r10 readable foam ball

The place I use is the outdoor rooftop of a city building
I used it as a regular golf ball, but the locals complained about the sound of the golf ball.
So I used foam ball and experimented with r10.
r10 read only 20% and couldn't read it again after changing the golf club
I will let you know the result after using various foam balls.
First of all, a basic 10-gram foam ball cannot be read even by 20%.
The 20 gram eva golf ball reads well, I almost never used a golf ball.
Seeing many people talking (almostgolf ball 13g), I think it takes at least 13g to read it.
Eva golf balls are good, but even though the sound of hitting is half that of a regular golf ball, I thought it was loud, so this time I would like to experiment with a golf ball weighing 15 grams of foam and 15 grams of pp plastic.
So 8-10 grams of foam golf balls are hard to read, so be careful and r10 seems to have an effect on the weight of the ball
sorry for using a translator