Arizona Sun Glass Crystal Nail File. Our nail files are tough enough to consistently maintain their original appearance, but gentle enough to be used on both artificial and natural nails. With regular use, they can prevent splitting and peeling. NEVER BUY ANOTHER NAIL FILE AGAIN! These nail files are fabulous!!!! arizonasun.com is laser etched into crystal. Each file comes with a protective sleeve. 5 1/2 inches long.