√The package contains 12 white plastic golf balls, which are durable and lightweight. The diameter is about 42mm, and the weighs about 4g, to ensure true spin and precise separation of a full ...

Occasionally I practise golf in my back walled garden with old golf balls and plastic balls. I take them in at night-time. A few days ago, I forgot and left 54 golf balls and 20 plastic balls out.