The Protektive Pak shipping, handling, and storage containers are constructed of impregnated corrugated material for greater durability Static dissipative surface resistance of 1 x 10⁶ to < 1 x 10⁹ ohms per ANSI/ESD STM11.11 Buried shielding layer minimizes the potential of sloughing and rub-off contamination Easy assembly without the need for tape, glue, or staples Includes punch out hand holes for ease of handling. Hand holes are not available for 37501, 37508, and 37509 Made from 100% recycled material and is 100% recyclable Lid may be purchased separately. Made in the United States of America.