FTA-550: 0.25mm trapezoidal perforation FTA-551: 0.5mm trapezoidal perforation FTA-552: 0.75mm trapezoidal perforation FTA-553: 1.0mm trapezoidal perforation FTA-554: 2.0mm trapezoidal perforation FTA-560: 2.0mm square perforation FTA-561: 4.0mm square perforation FTA-562: 6.0mm square perforation FTA-563: 8.0mm square perforation FTA-564: 10.0mm square perforation |