0.68 Caliber,Its total length 16",1-Piece Barrel.incorporates internal spiral rifling enhance ball rotation.improved ball flight and unmatched accuracy. Highly durable and long lasting.The high quality of these rifled barrels will give you supreme performance on the field!This barrel is Tippmann 98 thread.It fits Tippmann 98, BT-16, US ARMY ALPHA BLACK, PROJECT SALVO, CARVER ONE, TANGO ONE, BRAVO ONE AND SIERRA ONE Barrels.