Umarex - CB 50 Chalk Balls (.50 Cal) - 500 rnd 1,843.01 CZK 1,712.76 CZK .50 caliber Chalk Balls for target practice with paintball pistols. Perfect when training your aim. The product is currently out of stock. .50 Kaliber kalkboll Skal av plast med kalkfyllning BUY MORE Share Article Number: 2147 Information Reviews .50 cal Chalk balls from Umarex. Perfect for training with markers.