1Made of raw wooden material, safer, reliable, and has no effect on pet health. 2With an iron chain and hook, can be hung on the cage or placed at the bottom of the cage, easy to install. 3Applicable to small rodents such as hamsters, gerbils, mice, chinchillas, guinea pigs, hedgehogs, etc. Also suitable for birds. 4Convenient for pets to climb and play, relieve their annoy mood, more reliable and practical in use. 5A good toy for small pets to play or grind their teeth in the cage, to show better performance.