Type

Common Examples

Domestic

International

Domestic Mail

Maximum Amount Permitted in Mail

Additional Information

Air

Surface

DMM

PUB 52

Miscellaneous

Dry ice

Y

Y

N

601.10.20.4

349.23

601.10.20.4

5 lbs. maximum for air (surface may exceed 5 lbs.) (Proper forms/warning labels required for air only.)

Magnetized materials

Y

Y

Y

601.10.21

349.24

601.10.21

Depends on magnetic strength.

Lithium metal battery

Y

Y

Y

601.10.20.5

349.221

601.10.20.5

See the IMM® for international mail restrictions.

Lithium ion battery

Y

Y

Y

601.10.20.6

349.222

601.10.20.6

See the IMM for international mail restrictions.