I am a fan of black ice pine and they are very durable but this type of ventilation is not, 2 days stay with a strong smell but after the 3rd day it is very easily and before the week goes by. I only use 2 because 4 at a time is too much for the first two days, but after that it loses flavor just as much. Easy to install and there are 4 in each pack. It's a bit pricey but if it were a bit more durable I wouldn't mind paying what it costs but for the quality it is it is not worth.
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