The Preface® Braided Guiding Sheaths from Biosense Webster are designed to provide transseptal access to the left heart, which always has been challenging. The Preface® Braided Guiding Sheaths provides access to the left side of the heart with safety, confidence and ease. The Preface® Braided Guiding Sheaths also provides precise stability and directional control which is required to navigate through the septal wall. The primary features of the Preface® Braided Guiding Sheaths from Biosense Webster are enhanced safety, excellent control and smooth transition. For safety purposes the instrument comes with Radiopaque BRITE Tip® Interventional Sheath Technology that provides exact tip visibility under fluoroscopy and low-friction oblique cut valve that provides excellent hemostasis. For control purposes the instrument has double wire braided shaft that enhances torque and pushability and multi-segment design and for smooth transition the instrument has nylon (PTFE) coated inner surface and tapered profile.