Each SMB Copper 375 (Cu 375) frame is made from compound of Low Density Polyethylene and Barium Sulphate (15% - 24%) with two flexible arms with spurs. A OFE Copper wire (Diameter 0.39 mm ± 0.01 mm) is wound around the stem, giving a total copper surface area of 375mm2 ±20mm2. The ?Frame? is equipped with Polyamide Monofilament (Suture) for checking the presence/position and easy removal. It is packed with an insertion tube in a Tyvek - Mylar film pouch or Mylar - Mylar film pouch. The insertion tube is equipped with a movable flange to aid in gauging the depth to which the insertion tube should be inserted through the cervical canal and into the uterine cavity.