Which of the following sizes does a Pi-Ball come in?

The correct choice reflects the standard sizes of Pi-Balls, which are used in various applications, including parachuting. Pi-Balls come in specific weights to ensure precision during jumps, and the common weights recognized in training and practice are indeed 10 grams and 30 grams. These sizes allow for proper deployment and stabilization of parachutes during descent.

In parachuting, having standard weights is crucial for both training and operational effectiveness, as the weight of the Pi-Ball affects its performance and behavior in the air. Understanding the correct sizes is essential for jumpmasters, as they need to ensure they are using the right equipment for safe and accurate jumps.