Soldato
Poppy's favourite balls are the Chuck-Its. Blue & Orange for daytime (I have to have the next ball lined up in the chucker, ready to throw again, or she won't let go of the first when she brings it back!)As chrisxl200 mentioned, the Chukit balls seem.pretty indestructible, but a bit more expensive, about £15 for a 3 pack.
My current and previous Lab haven't managed to finish one off . The more solid ones dont squeak but make a whistling noise when thrown etc.
Also have a glow in the dark Chuckit which is great if you charge the glow with a torch - we use this on after-dark walks (mainly summertime, when it's too hot to go out in the day)