[Ball Size] Our hamster exercise ball is made of high quality plastic, which is light and durable. The diameter of this hamster exercise ball is 4.7 inches. Please choose the appropriate ball according to your your pet’s actual size. [Stay healthy] The transparent design of the exercise ball allows you to see clearly when the hamster is playing sports, and you can play with your pet for more fun. And it’s also equipped with a snap lock, which prevents hamsters co.ukom suffocating when they run inside. [Rest Area] Our ball can be a great temporary stopping place to hold your hamster while you clean their house. Relieves boredom, increases activity level and gives it a fun place to play. [Use] Align the positions of the buckles of the two hemispheres, buckle them in the correct position and turn them slightly clockwise to lock them. 2.If you are covering the top cover, be sure to align the four click positions and turn to the right to secure it. 3. Place your hamster in the plastic ball