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Some joints need boots, some don't. the ones that don't are the teflon lined joints, they self lubricate, and rid themselves of dirt and moisture through normal operation. Putting a boot on such a bearing WILL trap in moisture, and dirt, wearing it out faster.
The shittier joints that are not teflon lined need boots so nothing gets on the ball bearing suface. So basically if you have the option, get the joint that doesn't need the dust boot.
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