With a rough side for trimming, and a smooth side to protect sensitive birdie feet, Safety perches can help keep nails and beaks in top condition. Medium size is approximately 8-1/2 inches long and measures approximately 1 inch in diameter. Appropriate for small birds such as Pionus, small Cockatoos, Timneh Greys, and and similar sized birds. Non-toxic and safe for your bird. No sanded surface to harm feet.Stimulates leg muscles and promotes healthy feet.