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Figure 8 (A) Four coils of different dimensions. A, 0.035-in. (0.089 cm) gauge, 4-cm length, 3-mm diameter; B, 0.038-in. (0.097 cm) gauge, 5-cm length, 5-mm diameter; C, 0.038-in. (0.097 cm) gauge, 10-cm length, 8-mm diameter, D, 0.038-in. (0.097 cm) gauge, 8-cm length, 10-mm diameter. Notice the centers of the 3- and 5-mm diameter coils are completely covered by Dacron fibers. In contrast, the centers of the 8- and 10-mm diameter coils are incompletely filled by Dacron fibers, and one can see through them (arrows). (B) Side view of the four coils. Note the smaller coils are more compact compared with the larger coils, which have a much larger side profile and can result in coil protrusion into the aorta or pulmonary artery.