This ledge allows for ramping between platforms providing traction and grooves that function like steps when angled. Make moving around more fun and varied for your pets, this texture can enrich their habitat. Washers Are Big - Washers are meant to lay against multiple cage bars for stability This product contains 1 ledge with the washers, bolts, and wingnuts to secure it. The platform is created large for even Syrian Hamsters, chinchillas, rabbits, and birds. This wood is kiln dried aspen, one of the best woods for small pets to be around/nibble on Aspen is far superior to pine and won't irritate your pets sensitive sense. The edges of the platform most commonly used by pets are generously rounded and sanded smooth by me to prevent injury.