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This comes with two variants of BQR-2 lower bow chin sonar domes, the simple ovid/round shape version as well as one that comes to a pointed trailing edge. In addition, you also get the small upper deck sonar dome (x 2), the lower hull sonar blister (x 2), as well as a messenger bouy (x 2). You'll need to refer to you reference material for placement.
If you're creating a Fleet Snorkel from any of the AFV Gato kits you might find these useful to provide the missing sonar domes, etc., that don't come with those kits. You also might consider this as the AFV GUPPYs only come with the ovid BQR-2 sonar dome, and not the one that comes to the sharp trailing edge.
For trimming the parts from their sprue I'd recommend using a small kerf'd razor saw. The temptation to use a sprue trimmer could lead to localized shattering where the sprue detaches from the part. Something to keep in mind.