All carbon mast tubes are shipped in a USPS triangular box and are shipped via Priority Mail with insurance, this is due to weight and overall size of package. Shipping costs for a single carbon fiber mast tube within the United States is approximately $9.00. When ordering multiple carbon mast tubes you will be charged more due to overall weight. The overall weight is not the same as what is calculated, you will be refunded the extra costs due to these calculations. This is all TBD at the time when your order is shipped.