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0.75 oz is the typical light air spinnaker for perhaps 5 to 15 knots AWS. In heavier wind there is some risk of ripping the spinnaker when stuffing the bow into a wave.
The 1.5 oz spin is usually a heavy weather design, for perhaps 15 to 30 knots AWS. It's also usually physically smaller than the light air spin.
If searching for a used one, take a handful of the nylon cloth, press your lips up to it and try to blow through the cloth. If you can, pass. If you can't, then buy it. it is possible to find a used one, since quite a few don't get used as much as they should.
There are also shape variations: Code 0, Code 3 Code 5. Read Hancock's book "Maximum Sail Power" as he has a great section on this subject.
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