Safety and environmental protection material: adopt environmental protection material, safe, no smell, please feel free to use. It's 15 centimeters in size (about 5.9 inches).Porous design: Increase the ball friction and air circulation, pets will not heat or feel difficult to breathe staying inside for a long time. Easy to operate:The both cover is designed with a dark buckle. When the installation is performed, the position of the dark buckle of the cover is aligned with the corresponding position of the running ball, and the cover needs to be screwed until it is screwed to the head.The Lids on both sides cover is the entrance for the pet, and a small hole is reserved in the middle. Exercise toy: This ball allows the Hamster to mix play and exercise, making it more enjoyable for the hamster and more motivated to keep in good shape. Keep Healthy---Its transparent design will make you see clearly while the hamster doing exercise, and you can play together with your pet to increase more pleasure. Perfect Place---Fashionable, nice design, cute and lovely. An ideal place designed for your little friends, safe and warm for them to sleep or play inside. Made with pet safe materials.Relieves boredom and increases activity level and giving him a fun spot to play Ideal for hamster, mouse and other small furry animals.Encourage healthy exercise in a secure and safe way Makes a great temporary holding area to keep your furry friend while you clean their home 5.9-inch diameter .For dwarf hamsters, mice, or other small animals Fun exercise toy to maintain your pet's alertness and agility.Provides interactive fun for the pet and the pet owner If the pet uses it for the first time and cant play. It is recommended that you do not need to worry. You can leave the little pet in the running ball for 1-2 hours, let the pet become familiar, remember not to be reluctant, or it will aggravate the fear. After familiar with the toy, the little pet will gradually learn to avoid obstacles when he runs on the ground. How To Assemble the Hamster Plastic Ball 1.Align the buckle positions of the two hemispheres, buckle up to the correct position, and turn slightly clockwise to lock 2.When covering the top cover, pay attention to align the four snap positions , and turn to the right to fix 3.Put your hamster into the plastic ball and watch them play on the flat floor Pacakge Included: 1 x Hamster Exercise Ball