When shipping dangerous goods in limited quantities (Gross Mass less than 30 kg)by ground within American states, hazard class labels, placards, general markings, or addresses are NOT required for packaging. However, you must display a Limited Quantity Label For Ground/Surface Transport. When shipping by air, Limited Quantity shipments must have a “Y” in the Packing Instruction column of the declaration. All marks and labels like hazard class labels, addresses, net weights, etc., are required. The Limited Quantity Label for Air is required with “Y” in the center.