general information:
t8 8gr per foot 6-7ips (inches per second) color: red
t11 11gr per foot 7-8ips (inches per second) color: green
t14 14gr per foot 8-9ips (inches per second) color: blue
t17 17gr per foot 9-10ips (inches per second) color: grey
t20 20gr per foot 10+ips (inches per second) color: black