This is the First Strike Magazine or T8.1 Magazine. It will feed the Tiberius First Strike rounds or normal .68 caliber paintballs. This magazine fits the Tiberius Arms T8, T8.1, T9, and T9.1 Paintball Guns. The standard T8 or T9 magazine is not made anymore. This one replaces both of those since it will do everything the old magazine used to do.