Drop-in lid creates enclosure and prevents product from falling out or being damaged by other objects being placed on top Finger notches in lids for easy lifting Constructed of impregnated corrugated material for greater durability Static dissipative surface of 1 x 106 to < 1 x 109 ohms Buried shielding layer minimizes the potential of sloughing and abrasion contamination Made from 100% recycled material and is 100% recyclable Made in the United States of America.