LIMIT ON THIS ITEM IS ONE CARTRIDGE PER CUSTOMER!

ONE CARTRIDGE, NOT A BOX! The box is for reference only!

One Cartridge not a Box,  28 Gauge paper shotgun shell by the long closed Peters Cartridge Company, Rustless Brand, High Velocity with  " PETERS MADE IN USA H.V. 28 " Head-Stamp with unique artwork on the head stamp., "Rustless HIGH VELOCITY, USE IN 28 GA> Guns only" printed on a dark blue case. 

A short story on shot-shells:
Shot-Shells have been produced for over 2 centuries in many sizes, from 00 gauge to .360 gauge  and also in millimeters sizes.
For those not familiar with shot-shells the lower the gauge number the larger the size. A 20 gauge is smaller then a 16 gauge, a 16 gauge is smaller then a 12 gauge etc.
A gauge is a unit of measurement in shotguns, determined by the number of lead balls the size of the gun's bore (inside barrel diameter) that can be produced out of a pound of lead.  A 20 gauge gun size has 20 balls per pound, a 12 gauge has 12 balls, hence the smaller the gauge number the large the bore or size of the shell