The United States Postal Service recently introduced new Priority Mail Flat Rate Precious Cargo Boxes^TM to its lineup of shipping materials. Here’s what you need to know.

What are they?

These new Flat Rate boxes, fitted with polyethylene foam dots and inserts, are designed to give customers a more secure way to ship valuable items like smartphones and laptops. Three types of boxes are available:

It’s worth noting that these new boxes can’t be used for damaged or defective recalled devices unless specifically approved by USPS.

How much do they cost?

Customers using these new boxes will be charged Priority Mail Flat Rate postage, but will also be charged an additional cost for the boxes. The small box costs $6.99, the medium box costs $12.99 and the large box costs $15.99.

Where do I get them?

A pilot test for these boxes began Sept. 1 and will last approximately six months, according to a recent Postal Bulletin article. During the pilot, boxes can only be purchased through the Postal Store.