Umarex T4E RB 50 Performance Rubberballs .50 Cal 500 rnd 61.21 GBP 57.61 GBP Performance Rubberballs in .50 cal. Slightly heavier and harder than normal rubberballs. Perfect for target practice. BUY .50 Kaliber gummikulor Innehåller 500st kulor BUY MORE Share Article Number: 2621 Information Reviews Large package containing 500 rounds of .50 cal "performance" rubber balls from Umarex.