No Nails, No Staples, Only Glue - Created with pet safety in mind. Bolts Are Flush - Wood is countersunk so your pets won't bite on metal. Washers Are Big - Washers are meant to lay against multiple cage bars for stability This product contains 1 platforms with the washers, bolts, and wingnuts to secure both. The platforms are 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. The glue used is safe for small pets.