Abstract: A vasoocclusive device 10 is adapted for introduction into a vessel of a human or veterinary patient and occluding flow through the vessel. The device 10 includes a radiopaque member 12 (such as a metallic coil 14) having a proximal end 16 and a distal end 18, the distal end 18 being introduced first into the vessel. The member 12 is about 1.5 mm to about 3.0 mm long and no more than about 2.7 mm wide, preferably about 0.25 to 0.4 mm wide. The device 10 also includes a distal plurality 20 of fibers having an average distal fiber length, associated with and extending away from the distal end 18 of the member 12, as well as a proximal plurality 24 of fibers having an average proximal fiber length, associated with and extending away from the proximal end 16 of the member 12. The average proximal fiber length is about two to about five times the average distal fiber length. The average distal fiber length is preferably about 4 to 8 mm, while the average proximal fiber length is preferably about 9 to 15 mm.