Hand collected in the Sonoran desert of Arizona. These Cholla "Cactus Wood" pieces add an amazing look to aquariums, terrariums, & so many other places. Create potential hides for small fish, shrimp, reptiles, or other creatures & critters. All pieces vary in color/pattern/hole size etc... Most have an inner hole size of .75"-1.25". Pieces usually need to be soaked &/or boiled several times to sink in water & release natural tannins to prevent tank discolorations.