This is a Winchester Ammunition Shotshell known as the Super-X chambered in 12 Gauge 3", model X123MT5.
Since 1922" Super-X ammunition has provided exceptional quality and outstanding performance for all types of hunters and shooters who rely on its time-proven dependability backed by legendary excellence.
Features:
12 Gauge
1,210 Feet per second
3 Inch
1-7/8 Ounce #5 copper plated hard shot
10 Rounds per box