The Minelab E-Trac comes with the 11 FBS, one of the best Minelab coils. But the coils of alternative manufacturers are often not inferior to the original; in addition, they give users a free choice. See an example: a photo report of Mars Tiger coil for Minelab E-Trac.
This is the coil from Mars MD (alternative manufacturer). Type: DD. Shape: ellipse. Size: 12.5 x 9.5 inches (32 x 24cm). More about Marsmd Tiger coil.