Constructed from resilient wood and quartz, these perches are 100% natural and non-toxic, fostering healthy digestion. Sand Perches offer birds ample foot exercise and the sand-coated surface keeps beaks and talons trim. Different lengths, thicknesses, styles and materials of perches help keep birds' grip strong. Every hardwood bird perch has a metal wing-nut and built-in bolt, eliminating the need for any additional equipment for installation.