hamster ball,dwarf hamster ball,hamster balls for dwarf hamsters,hamster balls for syrian hamsters,hamster wheel,hamster car wheel,hamster exercise balls High-quality Materials Hamster exercise ball is made of high-quality plastic material, environmentally friendly, safe and durable, Let your pets to have a lot of fun in their own place. Flash Hamster Toy Ball Size: 12.5cm in diameter(about 4.9 inches). When the running ball moves at a speed of 30cm/s or when it hits a corner of a wall, it will flash automatically, especially at night, which is very cool. Porous designWith the porous design, can increase the ball friction and air circulation, pets will not heat or feel difficult to breathe staying inside for a long time. Good for HealthThis hamster toy can maintain your pet's agility, prevent obesity and keep them physically healthy and active. It also provides a lot of fun for hamsters, relieve boredom and stress, and maintain mental health. Easy to InstallThe both cover is designed with a dark buckle. First align the buckle positions of the two hemispheres, buckle them to the correct position, and then rotate slightly clockwise to lock. Both covers are designed with dark buckles. The lids on both sides of the lid are entrance pets. Note: The product is manually measured, there may be some size differences, please kindly understand. Due to monitor differences or other reasons, the color of the product might be slightly different, please kindly understand