Good. I had a hard time verifying that. Firstly, if you're installing LED bulbs with fans in your car, you'll probably need something like this simply because of their length and the need to conduct heat away from the case. When I bought my bulbs I was told they would fit my 2016 Ford Explorer Sport. However, they were the wrong overall diameter and the rubber was too thick to fit the gap on this particular machine. They're probably a great product, but they just didn't meet my specific needs. Because the LEDs I installed were intended for dedicated high beams which I don't use long enough that the bulbs get too hot to melt anything without proper ventilation (IMO) and because my dust covers are all that Having had a chance to fit over these longer bulbs, I only play with the original dust caps, which fully insulate the bulb (and any heat) inside the case. However, to each his own.
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