Yeah, the plastic ones are 10 degrees. The angle change from 10 to 12 is so small only the most consistent drivers will notice. I used the alu 12 degree ones until I found that the hole for the kingpin screw oval'led from wear and led to a fair amount of slop. Since then I've stuck with the plastic ones. I'd recommend them on low grip surfaces for a little more entry steering, but on carpet I prefer the plastic ones as I have plenty of steering from the tires anyway.
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