T4E, Training 4 Engagement, has developed a line of markers for training and protecting. On the protecting front, these .50 caliber pepper (OC) balls fit .50 caliber T4E markers to provide highly effective deterrents. These pepper balls have a tough outer shell that is designed to break with high-speed impact. T4E pepper balls are red and white-colored and sold in a 10 count tube for easy and safe storage. Defense PEB 50.