The next generation wire from MAX is a twin spooled 19 gauge wire. There is one spool of twin spooled wire per box. 1 case of twin tier wire should equal approximate output of 2 cases of traditional TW898 wire. The reason the output is greater is because the RB441T uses less wire and creates tighter ties. There is a reverse clutch on the tool allowing it to draw wire back into the tool and tightening the tie. The wire is made in Japan.