Im going to buy some new steels and ive found some but they have measurements on them and i dont know what its for..

It reads - T 98/NB 1389ccm 66 kW BJ.: 03.1999-03.2004

I know these are right but the only thing im not sure on is the '1389ccm'??? What do these numbers mean? Theres only two i can chose from but im not sure on what that number means..

Any help would be appreciated.

Thanks, Joe.