Shipped by UPS in DOTE-8249 packaging or by Motor Freight only. Note: magnesium and magnallium marked as FS and/or those with 50% chips CAN be shipped by USPS with no hazmat fee. Now restricted under the injunction. Please see our home page under the heading 'please read this before ordering'). This is by far the most popular Mg particle size we sell. Used extensively for tracers and tracer ignition comps, as well as other similar useage. Wide range of uses!! No ATFE is required to purchase.