Sweet Feet and Beak’s Comfort Grip Natural Patented Safety Perch have been approved by pet owners, veterinarians, bird breeders. It has a rough side for trimming, and a soft side to protect sensitive birdie feet, Safety perches can help keep nails and beaks in top condition. The beak conditioner was found to keep the bird's beak in a naturally healthy state of trim and also simulate activity in the wild. Extra small size is approximately 4-1/2 inches long and measures approximately 5/8 inch in diameter. Appropriate for extra small birds such as finches, canaries and small budgies, lovebirds, and similar sized birds.