# Magnetized materials with field strength exceeding 0.00525 gauss at 15 feet — Postal shipping restrictions by item category

For Magnetized materials with field strength exceeding 0.00525 gauss at 15 feet, carrier is USPS; restriction type is prohibited; scope is all domestic and international air transportation; conditions is Prohibited from air transportation under any circumstances, recorded from its source on 2026-08-04.

- **Item category:** Magnetized materials with field strength exceeding 0.00525 gauss at 15 feet _(unconfirmed — we could not tie this to the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** prohibited _(our reading, not quoted from the source)_
- **Scope:** all domestic and international air transportation _(our reading, not quoted from the source)_
- **Conditions:** Prohibited from air transportation under any circumstances _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Materials with a field strength over 0.00525 gauss at 15 feet are nonmailable in domestic and international air transportation under any circumstances.

## Source

- https://pe.usps.com/text/pub52/pub52c3_028.htm

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).