Give your small furry friend the perfect exercise experience with this hamster ball measuring 3.9 inches in diameter. Designed specifically for dwarf hamsters and gerbils, this quiet-running exercise ball allows your pet to explore safely while getting necessary physical activity. The design lets you keep an eye on your pet's movements and ensures they stay visible during playtime. The ball features smooth interior surfaces for comfortable running and adequate ventilation holes for proper airflow. This entertaining toy provides an excellent way for small pets to exercise outside their cage while staying safe and contained. Perfect for supervised play sessions, this exercise ball helps promote healthy activity levels in your small animal companion. Remember to always monitor your pet while they're using the ball and limit exercise sessions to appropriate durations.