Product review (4 stars): Good quality which lasts for months.
There are two types of humidifier wicks out there.  This is the good type.

The cheap type takes a piece of material, perforates it and then stretches it out to form a honeycomb pattern.  It takes only a few pieces to make a wick.  Because so little material is used, it doesn't take long for this type to clog with minerals and need replacing.  They only last a month for me.

But this product is the good type which takes many pieces of material and glues them together.  This greater amount of material allows for more water to wick up, humidification occurs more quickly and the wick last me almost five months before needing replacement.