[quality] this hamster ball is made of high quality plastic, strong and durable, not easy to damage [installation] the installation of the hamster toy ball is very simple, it just attach the two hemispheres and the lid, then flip them over to lock them in place and assembly can be done in seconds [safety] transparent hamster race ball design allows you to observe your adorable little pet at any time. Assembled hamster balls are not easy to fall off and hurt your pet [sport] Running the ball allows your Hamster to enjoy sports. There are several well-ventilated holes in the ball for your small pet to play for a long time. [application] hamster Sports ball is suitable for hamsters, golden bears and other small furry animals. The racing ball has a diameter of 12 cm so that your small animal can play as he wishes